The drawing shows a circuit that contains a battery, two resistors, and a switch.

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The drawing shows a circuit that contains a battery, two resistors, and a switch.

[From: ] [author: ] [Date: 12-08-02] [Hit: ]

I understand this is a parallel circuit, but Im still getting the incorrect answers!-With the switch open the resistance is just R1. The power delivered is V^2/R = about 1.With the switch closed you have R1,R2 in parallel which is63.......

Consider the circuit with R1 = 63.9, R2 = 100.8, and V = 8.9.
Drawing: http://www.webassign.net/cj7/20-p-052-alt.gif

Please help! I understand this is a parallel circuit, but I'm still getting the incorrect answers!

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With the switch open the resistance is just R1. The power delivered is V^2/R = about 1.24W

With the switch closed you have R1,R2 in parallel which is 63.9*100.8/(100.8+63.9) or about 39.1ohms. So the power delivered is about 2.03W

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You didn't ask a question...
When switch is off then current is 6/63.9. (V/R=I)
When switch is on then current is (V/R=I) 1/Rtotal= ((1/63.9)+(1/100.8.) Plug in.

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What exactly is the question ?

1

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