Gr 9 NATURAL SCIENCES: CH 3.5 Safety practices
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Questions and Answers

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

  • It increases the overall resistance
  • It reduces the overall current
  • It allows multiple devices to operate independently (correct)
  • It makes the circuit more complex

    • What happens when too many devices are connected to a parallel circuit?

  • The circuit becomes more efficient
  • The risk of overloading increases (correct)
  • The current remains unchanged
  • The overall resistance decreases

    • What is the purpose of earthing in electrical appliances?

  • To increase the voltage
  • To reduce the current
  • To prevent electric shocks (correct)
  • To make the appliance more efficient

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

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

    What is a short circuit?

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

    What is the function of a fuse in an electrical circuit?

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

    What is the purpose of a circuit breaker?

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

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

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

    What is the benefit of using safety devices like fuses and circuit breakers?

    <p>They protect users and appliances from electrical hazards</p> Signup and view all the answers

    Why do parallel circuits not increase overall resistance when adding devices?

    <p>Because the devices are connected in parallel</p> Signup and view all the answers

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

    <p>The circuit will become overloaded</p> Signup and view all the answers

    What happens to the current when a live wire touches the metal casing of an appliance with proper earthing?

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

    What is the result of a short circuit in an electrical circuit?

    <p>A surge in current</p> Signup and view all the answers

    What is the purpose of safety devices like fuses and circuit breakers in electrical circuits?

    <p>To protect against overloading and short circuits</p> Signup and view all the answers

    What happens when a fuse melts in an electrical circuit?

    <p>The circuit is broken</p> Signup and view all the answers

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

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

    What is the function of the neutral wire in a washing machine circuit?

    <p>To carry current away from the appliance</p> Signup and view all the answers

    What is the purpose of connecting the exposed metal parts of electrical appliances to the ground?

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

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

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

    What happens to the flow of current through the earth wire if a live wire touches the metal casing of an electrical appliance without proper earthing?

    <p>The current increases and flows through the metal casing</p> Signup and view all the answers

    What is the primary consequence of overloading a parallel circuit?

    <p>An increase in the risk of electrical fires</p> Signup and view all the answers

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

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

    What happens when a fuse melts in an electrical circuit?

    <p>The circuit is automatically broken to prevent further damage</p> Signup and view all the answers

    What is the primary reason for using multiple circuits in a home?

    <p>To ensure that each circuit can handle a specific load</p> Signup and view all the answers

    What is the primary consequence of a short circuit in an electrical circuit?

    <p>Damage to appliances and overheating</p> Signup and view all the answers

    What is the primary benefit of using earthing in electrical appliances?

    <p>To reduce the risk of electrical shocks</p> Signup and view all the answers

    What happens when a live wire touches the neutral wire in a washing machine circuit?

    <p>The current remains unaffected</p> Signup and view all the answers

    What is the primary purpose of connecting the exposed metal parts of electrical appliances to the ground?

    <p>To reduce the risk of electrical shocks</p> Signup and view all the answers

    What is the primary advantage of using parallel circuits in homes, in terms of managing devices?

    <p>It enables devices to operate independently</p> Signup and view all the answers

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