Consider the two arrangements of batteries and bulbs
shown in Figure P18.66. The two bulbs are identical and
have resistance R, and the two batteries are identical with
output voltage ΔV. (a) In case 1, with the two bulbs in series,
compare the brightness of each bulb, the current in each
bulb, and the power delivered to each bulb. (b) In case 2,
with the two bulbs in parallel, compare the brightness of
each bulb, the current in each bulb, and the power supplied
to each bulb. (c) Which bulbs are brighter, those in
case 1 or those in case 2? (d) In each case, if one bulb fails,
will the other go out as well? If the other bulb doesn’t fail,
will it get brighter or stay the same?
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