22.1 – Investigating Current and Voltage Relationships (Leaving Cert Physics): Quizzes

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22.1 – Investigating Current and Voltage Relationships
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What is an ohmic conductor?

Material where II ∝ VV at constant temp

What condition must be maintained for a conductor to show ohmic behaviour?

Constant temperature

How must an ammeter be connected in this circuit?

In series with the circuit

How must the voltmeter be connected to measure voltage across the resistance wire?

In parallel with resistance wire

What is the purpose of the variable resistor in this experiment?

Control voltage and current values

Why should you start with small voltage values in this experiment?

Prevent wire heating significantly

How many measurements should be taken across a suitable range?

At least 6-8 measurements

What should be plotted on the axes when graphing results?

II on y-axis, VV on x-axis

What graph result proves the wire is an ohmic conductor?

Straight line through origin

What does the gradient of the II-VV graph equal?

1R\frac{1}{R}

Which formula represents Ohm's Law?

V=IRV = IR

Which devices are examples of non-ohmic conductors?

Diodes and filament bulbs

What is the most critical source of error in this experiment?

Heating from excessive current

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