A resistor of is connected in parallel with an unknown resistor across a ideal battery

PHYSICS · Subjective · A Level · Physics · Electricity · Electricity

Problem

A resistor of

4\,\Omega

is connected in parallel with an unknown resistor

R

across a

20\,\text{V}

ideal battery. The total current drawn from the battery is required to be

10\,\text{A}

. (i) Calculate the value of

R

that satisfies this requirement. (ii) For the value of

R

obtained in part (i), compute the power dissipated in each resistor.