Two resistors and are first connected in parallel across a battery for and are then…

PHYSICS · Single correct · A Level · Physics · Electricity · Electricity

Problem

Two resistors

R_1 = 4\,\Omega

and

R_2 = 6\,\Omega

are first connected in parallel across a

12\,\text{V}

battery for

30\,\text{min}

and are then re-connected in series across the same battery for the next

30\,\text{min}

. Neglecting any change in resistance, what is the total electrical energy dissipated during the entire one-hour period? (a)

2.16\times10^{5}\,\text{J}

(b)

1.08\times10^{5}\,\text{J}

(c)

1.34\times10^{5}\,\text{J}

(d)

2.68\times10^{5}\,\text{J}