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Physics Secondary Division 1: Electrical Circuits and Generators

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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?

The efficiency becomes zero Signup and view all the answers

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

Motor acts as a resistor Signup and view all the answers

In a generator, what does UM represent?

Total power output Signup and view all the answers

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

Total, useful, and power dissipated as heat Signup and view all the answers

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

Voltage across the receiver becomes equal to E' Signup and view all the answers

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

'e' is always unitless and < 1 Signup and view all the answers

What happens to P electric when P heat increases?

P electric decreases Signup and view all the answers