Physics Secondary Division 1: Electrical Circuits and Generators
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Questions and Answers

What is the relationship between the slope of a straight line in a graph of voltage (U) versus current (I) and the constant 'a'?

  • The slope is proportional to the constant 'a'
  • The slope is inversely related to the constant 'a'
  • The slope is not related to the constant 'a'
  • The slope is equal to the constant 'a' (correct)

In a receiver, when can Ohm's law not be applied according to the text?

  • When the receiver is functioning
  • When the switch is open (correct)
  • When the current is zero
  • When the voltage is zero

How is the efficiency of a receiver defined in the given context?

  • (E' + r'I) / (UM I)
  • (E' × I) / (UM + r'I)
  • P electric / E useful
  • (UM × I) / (E' + r'I) (correct)

What happens to the efficiency of a receiver if the motor is blocked?

<p>The efficiency becomes zero (B)</p> Signup and view all the answers

What does a zero value for E' signify in terms of a motor's operation?

<p>Motor acts as a resistor (C)</p> Signup and view all the answers

In a generator, what does UM represent?

<p>Total power output (D)</p> Signup and view all the answers

What division of powers occurs in a receiver according to the text?

<p>Total, useful, and power dissipated as heat (B)</p> Signup and view all the answers

What happens to the voltage across a receiver when the switch is open?

<p>Voltage across the receiver becomes equal to E' (D)</p> Signup and view all the answers

What can be said about the efficiency 'e' of a receiver based on P useful and P total?

<p>'e' is always unitless and &lt; 1 (A)</p> Signup and view all the answers

What happens to P electric when P heat increases?

<p>P electric decreases (D)</p> Signup and view all the answers

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