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A 120 Omega resistor dissipates 8 kJ of heat in... - WAEC Physics 2012 Question

A 120\(\Omega\) resistor dissipates 8 kJ of heat in 20s. Calculate the current through the resistor
A
5.8A
B
6.9A
C
30.0A
D
33.3A
correct option: a

Q = I2Rt

I = (\sqrt{\frac{Q}{Rt}})

= (\sqrt{\frac{8000}{12 \times 20}})

= 5.8

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