Current-Voltage Relationships (HSC SSCE Physics): Quizzes

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Current-Voltage Relationships
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Which three conditions are essential for electric current to flow in a circuit?

Free carriers, conducting path, force

What is the formula for potential difference VV between two points?

V=WqV = \frac{W}{q}

What does one volt (1 V) equal in terms of joules and coulombs?

1 J⋅C−11 \text{ J} \cdot \text{C}^{-1}

How must a voltmeter be connected to measure potential difference across a component?

In parallel across the component

What is the formula for resistance RR in terms of voltage VV and current II?

R=VIR = \frac{V}{I}

For a given applied potential difference, what does a low current indicate?

High resistance

What shape is the I-V graph for an ohmic component?

Straight line through the origin

What characterizes a non-ohmic component?

Resistance varies with applied voltage

How must an ammeter be connected to measure current through a component?

In series with the component

What is the resistance when no current flows through a component at all?

Effectively infinite

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