IB Physics SL B.5.3 Resistance

Practise calculating resistance from potential difference and current, reading operating points in circuits and using equivalent units or ideal-meter resistance appropriately.

Exam points

calculate R = V/I at the same operating point, with volts, amperes and ohms
find branch current and potential difference from circuit information before calculating resistance
recognise equivalent resistance units such as V A⁻¹ or W A⁻² and ideal meter limits

[Maximum number: 3]

(a)

Part 2 Electric current and resistance
The graph below shows how the current I in a tungsten filament lamp varies with potential difference V across the lamp.

[ 3 ]

(i)

Define the electrical resistance of a component.

[ 1 ]

(ii)

Calculate the resistance of the filament lamp when the potential difference across it is 2.8 V .

[ 2 ]

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B.5.3—Resistance question 1

Question (a)

Question (i)

Question (ii)