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

What is a short circuit?

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

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

<p>A surge in current (D)</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 (C)</p> Signup and view all the answers

What happens when a fuse melts in an electrical circuit?

<p>The circuit is broken (B)</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 (C)</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 (B)</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 (D)</p> Signup and view all the answers

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

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

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