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 (D)</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 (B)</p> Signup and view all the answers

What is a short circuit?

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

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

<p>It automatically breaks the circuit (B)</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 (B)</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 (B)</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 (A)</p> Signup and view all the answers

What is a consequence of illegal connections?

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

What is a safety hazard posed by illegal connections?

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

What is the primary purpose of Lightning Rods?

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

Why do some areas resort to illegal connections?

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

What is a consequence of electricity theft for utility companies?

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

What is a risk associated with illegal connections?

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

What is a benefit of promoting legal connections?

<p>Reduced risk of electrocution and fires (A)</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. (A)</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. (D)</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. (D)</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. (B)</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. (C)</p> Signup and view all the answers

What is the consequence of a short circuit?

<p>It can damage appliances and cause overheating. (B)</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. (B)</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. (C)</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. (C)</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. (A)</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 (C)</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 (C)</p> Signup and view all the answers

What is the primary risk associated with illegal connections?

<p>Fire hazards and electrocution (C)</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 (B)</p> Signup and view all the answers

What is the primary purpose of Lightning Rods?

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

What is a consequence of electricity theft for utility companies?

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

What is a solution to addressing illegal connections?

<p>Strengthening regulations and enforcement (B)</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 (A)</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 (D)</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 (C)</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 (D)</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 (A)</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 (A)</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 (D)</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 (A)</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 (B)</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 (B)</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 (C)</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 (C)</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 (B)</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 (A)</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 (D)</p> Signup and view all the answers

What is the primary function of Lightning Rods?

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

What is a consequence of electricity theft for utility companies?

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

What is a primary risk associated with illegal connections?

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

What is a solution to addressing illegal connections?

<p>All of the above (D)</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 (B)</p> Signup and view all the answers

What is a common characteristic of illegal connections?

<p>Exposed wires and insecure connections (B)</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 (B)</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 (B)</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 (B)</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 (A)</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 (A)</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 (D)</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 (A)</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 (B)</p> Signup and view all the answers

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

<p>Reduced investment in infrastructure improvements (A)</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 (A)</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 (B)</p> Signup and view all the answers

What is a common consequence of illegal connections?

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

Why do some individuals or communities resort to illegal connections?

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

What is the primary purpose of Lightning Rods?

<p>To safely channel lightning strikes away from buildings (A)</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 (C)</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 (B)</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 (D)</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 (A)</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 (A)</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 (C)</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. (D)</p> Signup and view all the answers

Why do some individuals opt for illegal electricity connections?

<p>All of the above. (D)</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. (B)</p> Signup and view all the answers

What is a safety hazard posed by illegal connections?

<p>All of the above. (D)</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. (D)</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 (A)</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 (A)</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 (A)</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 (B)</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 (C)</p> Signup and view all the answers

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