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Ohm's Law: Current equals voltage divided by resistance

If the two 3 ohm resistors are in series, then 12 volts divided by 6 ohms is 2 amperes.

If the two 3 ohm resistors are in parallel, then 12 volts divided by 1.5 ohms is 8 amperes.

WARNING: In the first case, this is 24 watts or 12 watts per resistor. In the second case, this is 96 watts or 48 watts per resistor. Exercise great care if you intend to duplicate this in the lab, i.e. do not think for even a split second that a 1/4 watt resistor is going to be able to handle this power without burning up and causing a fire.

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