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What is the resistance (in ohms) of a 75-W lightbulb in a 120-volt circuit?

tonichilds83

wrote...

Posts: 64

Rep:

11 years ago

What is the resistance (in ohms) of a 75-W lightbulb in a 120-volt circuit?

What is the resistance (in ohms) of a 75-W lightbulb in a 120-volt circuit?

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1 Reply

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Replies

zzz

wrote...

#1

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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