Physics · Unit 1 · Electrical circuits · Current, potential difference and energy flow
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A student investigates the behaviour of a resistor by measuring the current through it at different applied voltages. The results are shown in the table below. Interpret the experimental data to determine the resistance of the resistor.
A student investigates the current–voltage relationship for a length of nichrome wire at constant temperature. The wire is connected in series with a variable power supply and an ammeter. A voltmeter is connected in parallel across the wire. The student increases the supply voltage in steps and records the readings shown in the table below. Using the experimental data, interpret the results to determine whether the nichrome wire behaves as an ohmic resistor and justify your conclusion with reference to quantitative evidence.
A student measures the current through a resistor at different potential differences. The graph below shows the relationship between current and voltage for the resistor. Determine the resistance of the resistor.
A student investigates the relationship between current and potential difference for a wire resistor. The experimental data is shown in the table below. Interpret the data to determine whether the resistor is ohmic and calculate its resistance.