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tonichilds83 tonichilds83
wrote...
Posts: 64
Rep: 1 0
11 years ago
What is the resistance (in ohms) of a 75-W lightbulb in a 120-volt circuit?
Read 507 times
1 Reply

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zzz
wrote...
11 years ago
Recall Ohm's Law: V = IR

and that power: PW = IV

if we change Ohm's law around: I = V/R
and plug this into power equation: PW = (V/R)V = V²/R

PW = V²/R

75 = (120)²/R

R = 192 ohms
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