ing one? bulb 275 Circuit A shown in Figure 27.17 consists of a single light (R

Question

ing one? bulb 275 Circuit A shown in Figure 27.17 consists of a single light (R 288 20 and a 12 V battery. (a) What current is drawn from the battery? (b) What is the power dissipated in the light bulb? An identical light bulb is now added to Circuit A in series with the first (see Circuit B in Figure 27.17) (c) What is the current drawn from the battery in this case? (d) What is the current passing through each light bulb? (e) What is the potential difference across each light bulb? (f What is the power dissipated in each light bulb? g) What is the total power supplied by the battery?

Explanation / Answer

a)

Current

i = V/R

i = 12/288

i = 0.04167 A

b)

power

P = V i

P = 0.5 W

c)

current

i = 12 /288+288

i = 0.020 A

d)

curren passing through each bulb

i = 0.020

e)

potential difference across each bulb is 6 V

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