# physics.

posted by erica

when a lamp is plugged into a 120 V socket, each coulomb of charge that flows in the circuit is raised to a potential engergy of 120 joules?

which offers more resistance to water flow, a wide pipe or narrow pipe? I got wide as my answer.
Similarly which offers more resistance to the flow of charge, a thick wire or a thin wire? I got thin wire as my answer.

If the filliament resistance in an automobile headlamp is 3 ohms, how many amps does it draw when connected to a 12 volt battery? I got 36 watts?

1. drwls

1. Correct
3. They are asking for current (in amps), not power (in watts).

Use ohm's law.

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