Gr 9 NATURAL SCIENCES: CH 3.5 SUM Safety with Electricity
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Questions and Answers

Why are parallel circuits commonly used in homes?

  • Because they require less wiring
  • Because they reduce the risk of electrical fires
  • Because they increase the overall resistance
  • Because they allow multiple devices and lights to operate independently (correct)

    • What happens when you connect too many devices in a parallel circuit?

  • The circuit becomes overloaded and poses a risk of electrical fires (correct)
  • The overall resistance decreases
  • The devices start to work more efficiently
  • The current remains stable

    • What is the purpose of earthing in electrical appliances?

  • To increase the voltage
  • To reduce the current
  • To improve the efficiency
  • To prevent electric shocks (correct)

    • What color is the earth wire in a washing machine?

    <p>Green/Yellow</p> Signup and view all the answers

    What happens when a live wire touches the metal casing of an appliance?

    <p>The current flows through the earth wire to the ground</p> Signup and view all the answers

    What is a short circuit?

    <p>An unintended low-resistance path in a circuit</p> Signup and view all the answers

    What is the function of a fuse?

    <p>To melt and break the circuit when current exceeds a safe level</p> Signup and view all the answers

    What happens when a circuit breaker detects a surge in current?

    <p>It automatically breaks the circuit</p> Signup and view all the answers

    Why is it important to manage the load on each circuit?

    <p>To prevent overloading and electrical fires</p> Signup and view all the answers

    What is the primary function of Earth Leakage Circuit Breakers?

    <p>To detect any leakage of current to the earth wire and shut off power</p> Signup and view all the answers

    What is the main motivation behind illegal connections for some individuals?

    <p>To gain financial profit by supplying electricity to others</p> Signup and view all the answers

    What is a consequence of illegal connections?

    <p>Service disruptions and frequent outages</p> Signup and view all the answers

    What is a safety hazard posed by illegal connections?

    <p>Fire risk due to poorly made connections</p> Signup and view all the answers

    What is a solution to addressing illegal connections?

    <p>Implementing programs to extend legal electricity access to underserved areas</p> Signup and view all the answers

    What is the primary purpose of Lightning Rods?

    <p>To safely channel lightning strikes away from buildings</p> Signup and view all the answers

    Why do some areas resort to illegal connections?

    <p>Due to lack of access to legal electricity</p> Signup and view all the answers

    What is a consequence of electricity theft for utility companies?

    <p>Reduced investment in infrastructure improvements</p> Signup and view all the answers

    What is a risk associated with illegal connections?

    <p>Fire risk due to overheating</p> Signup and view all the answers

    What is a benefit of promoting legal connections?

    <p>Reduced risk of electrocution and fires</p> Signup and view all the answers

    What is the primary advantage of using parallel circuits in homes?

    <p>They allow multiple devices to operate independently.</p> Signup and view all the answers

    What is the consequence of overloading a parallel circuit?

    <p>It can cause excessive heat build-up, potentially leading to electrical fires.</p> Signup and view all the answers

    What is the purpose of the earth wire in a washing machine?

    <p>It connects the metal casing to the ground.</p> Signup and view all the answers

    What happens when a live wire accidentally touches the metal casing of an appliance?

    <p>The current will flow through the earth wire to the ground.</p> Signup and view all the answers

    What is the primary function of a circuit breaker?

    <p>To automatically break the circuit when a surge is detected.</p> Signup and view all the answers

    What is the consequence of a short circuit?

    <p>It can damage appliances and cause overheating.</p> Signup and view all the answers

    What is the primary function of a fuse?

    <p>To melt and break the circuit when current exceeds a safe level.</p> Signup and view all the answers

    Why is it important to manage the load on each circuit?

    <p>To prevent overloading and potential electrical fires.</p> Signup and view all the answers

    What is the benefit of using parallel circuits in homes?

    <p>They allow multiple devices to operate independently and safely.</p> Signup and view all the answers

    What is the purpose of earthing in electrical appliances?

    <p>To prevent electric shocks by connecting the metal casing to the ground.</p> Signup and view all the answers

    What is the main purpose of Earth Leakage Circuit Breakers?

    <p>To prevent electrical shocks by detecting current leaks to the earth wire</p> Signup and view all the answers

    What is the primary motivation behind illegal connections for some communities?

    <p>Due to lack of access to legal electricity</p> Signup and view all the answers

    What is the primary risk associated with illegal connections?

    <p>Fire hazards and electrocution</p> Signup and view all the answers

    What is the primary advantage of promoting legal connections?

    <p>Provides a safer and more reliable electricity supply</p> Signup and view all the answers

    What is the primary purpose of Lightning Rods?

    <p>To divert lightning strikes away from buildings</p> Signup and view all the answers

    What is a consequence of electricity theft for utility companies?

    <p>Higher electricity bills for legitimate consumers</p> Signup and view all the answers

    What is the primary benefit of extending legal access to electricity?

    <p>Increased access to electricity for underserved areas</p> Signup and view all the answers

    What is a consequence of service disruptions caused by illegal connections?

    <p>Economic losses for businesses and communities</p> Signup and view all the answers

    What is a solution to addressing illegal connections?

    <p>Strengthening regulations and enforcement</p> Signup and view all the answers

    What is the primary benefit of analyzing the dangers of illegal connections?

    <p>Identifying solutions to address illegal connections</p> Signup and view all the answers

    What happens to the resistance in a parallel circuit when more devices are added?

    <p>The overall resistance remains the same</p> Signup and view all the answers

    What is the main reason why parallel circuits are commonly used in homes?

    <p>They allow multiple devices to operate independently</p> Signup and view all the answers

    What is the primary function of the earth wire in a washing machine?

    <p>Connects the metal casing to the ground</p> Signup and view all the answers

    What is the consequence of overloading a parallel circuit?

    <p>It causes excessive heat build-up, potentially leading to electrical fires</p> Signup and view all the answers

    What is the primary function of a fuse in a circuit?

    <p>To break the circuit when the current exceeds a safe level</p> Signup and view all the answers

    What happens when a short circuit occurs in a circuit?

    <p>A surge in current occurs, potentially damaging appliances</p> Signup and view all the answers

    What is the primary function of a circuit breaker in a circuit?

    <p>To automatically break the circuit when a surge is detected</p> Signup and view all the answers

    Why is earthing important in electrical appliances?

    <p>It prevents electric shocks if a live wire touches the metal casing</p> Signup and view all the answers

    What is the primary benefit of using parallel circuits in homes?

    <p>They allow multiple devices to operate independently</p> Signup and view all the answers

    What is the consequence of not managing the load on each circuit?

    <p>The circuit becomes more prone to overloading and electrical fires</p> Signup and view all the answers

    What is a primary function of Earth Leakage Circuit Breakers in homes?

    <p>To detect any leakage of current to the earth wire and immediately shut off the power</p> Signup and view all the answers

    What is a common motivation behind illegal electricity connections in areas with no legal access?

    <p>To access a necessary utility that is not available</p> Signup and view all the answers

    What is a consequence of illegal connections on the power grid?

    <p>Overloading and frequent outages, affecting the entire community</p> Signup and view all the answers

    What is a primary benefit of promoting legal connections and extending access to electricity?

    <p>Improved safety and reduced risk of electrical fires and electrocutions</p> Signup and view all the answers

    What is the primary function of Lightning Rods?

    <p>To safely channel lightning strikes away from buildings</p> Signup and view all the answers

    What is a consequence of electricity theft for utility companies?

    <p>Reduced investment in infrastructure improvements</p> Signup and view all the answers

    What is a primary risk associated with illegal connections?

    <p>Both fire risk and electrocution risk</p> Signup and view all the answers

    What is a solution to addressing illegal connections?

    <p>All of the above</p> Signup and view all the answers

    What is a primary benefit of analyzing the dangers of illegal connections?

    <p>Improving the overall safety and stability of the electricity supply</p> Signup and view all the answers

    What is a common characteristic of illegal connections?

    <p>Exposed wires and insecure connections</p> Signup and view all the answers

    What is the primary mechanism that prevents electric shocks in a parallel circuit?

    <p>The earth wire connecting the metal casing to the ground</p> Signup and view all the answers

    What is the primary concern when connecting multiple devices in a parallel circuit?

    <p>The total current drawn by each device</p> Signup and view all the answers

    What is the primary function of a fuse in a circuit?

    <p>To melt and break the circuit when current exceeds a safe level</p> Signup and view all the answers

    What is the primary consequence of a short circuit?

    <p>A surge in current, potentially damaging appliances and causing overheating</p> Signup and view all the answers

    What is the primary advantage of using parallel circuits in homes?

    <p>They provide a practical and convenient way to manage electricity in a home, with devices operating independently</p> Signup and view all the answers

    What is the primary risk associated with illegal connections in terms of human safety?

    <p>Electrocution and fire hazards</p> Signup and view all the answers

    What is the primary benefit of promoting legal access to electricity?

    <p>Improving the overall stability of the electricity supply</p> Signup and view all the answers

    What is the primary function of Lightning Rods in terms of lightning protection?

    <p>To channel lightning strikes away from buildings</p> Signup and view all the answers

    What is the primary consequence of electricity theft for utility companies?

    <p>Reduced investment in infrastructure improvements</p> Signup and view all the answers

    What is the primary advantage of analyzing the dangers of illegal connections?

    <p>Increasing awareness about the risks of electrical fires</p> Signup and view all the answers

    What is the primary function of Earth Leakage Circuit Breakers?

    <p>To detect any leakage of current to the earth wire and shut off the power</p> Signup and view all the answers

    What is a common consequence of illegal connections?

    <p>Frequent outages and disruptions in the power grid</p> Signup and view all the answers

    Why do some individuals or communities resort to illegal connections?

    <p>To avoid paying for electricity</p> Signup and view all the answers

    What is the primary purpose of Lightning Rods?

    <p>To safely channel lightning strikes away from buildings</p> Signup and view all the answers

    What is a potential solution to addressing illegal connections?

    <p>Promoting programs to help communities gain legal access to electricity</p> Signup and view all the answers

    What is the primary advantage of using parallel circuits in homes?

    <p>Allowing multiple devices to operate independently</p> Signup and view all the answers

    What is the primary function of the earth wire in a washing machine?

    <p>To prevent electric shocks</p> Signup and view all the answers

    What happens when a live wire accidentally touches the metal casing of an appliance?

    <p>The current flows through the earth wire to the ground</p> Signup and view all the answers

    What is the primary function of a fuse in a circuit?

    <p>To break the circuit when current exceeds a safe level</p> Signup and view all the answers

    What is the consequence of overloading a parallel circuit?

    <p>Excessive heat build-up, potentially leading to electrical fires</p> Signup and view all the answers

    What happens when a Lightning Rod is struck by lightning?

    <p>It safely channels the lightning strike away from buildings.</p> Signup and view all the answers

    Why do some individuals opt for illegal electricity connections?

    <p>All of the above.</p> Signup and view all the answers

    What is a consequence of electricity theft for utility companies?

    <p>They incur higher costs for legitimate consumers and potential investment reductions in infrastructure improvements.</p> Signup and view all the answers

    What is a safety hazard posed by illegal connections?

    <p>All of the above.</p> Signup and view all the answers

    What is the primary function of Earth Leakage Circuit Breakers?

    <p>To detect any leakage of current to the earth wire and immediately shut off the power to prevent electric shocks.</p> Signup and view all the answers

    What is the main advantage of using parallel circuits in homes?

    <p>They provide a practical and convenient way to manage electricity</p> Signup and view all the answers

    What happens when a live wire accidentally touches the metal casing of an appliance?

    <p>The current flows through the earth wire to the ground</p> Signup and view all the answers

    What is the purpose of a fuse in a circuit?

    <p>To melt and break the circuit when current exceeds a safe level</p> Signup and view all the answers

    What is the consequence of overloading a parallel circuit?

    <p>Excessive heat build-up, potentially leading to electrical fires</p> Signup and view all the answers

    What is the function of a circuit breaker?

    <p>To automatically break the circuit when a surge is detected</p> Signup and view all the answers

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