Posted by **maryanne** on Monday, May 24, 2010 at 5:52pm.

What is the total resistance in a parallel circuit with a 10 ohm lamp and a 15 ohm lamp?

- physics -
**bobpursley**, Monday, May 24, 2010 at 6:33pm
There is a formula you can use, but instead, do this:

assume 150 volts>

Current in 10 ohm resistor= 15a

current in 15 ohm reistor= 10 a

Net resistance= V/I= 150/25=6 ohms

and of course, you can do it the geek way:

1/Rtotal= 1/10 + 1/15

1/Rtotal= (15+10)/150= 1/6

Rtotal= 6 ohms.

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