# physics

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Each of the four circuits in the drawing consists of a single resistor whose resistance is either R or 2R, and a single battery whose voltage is either V or 2V. The unit of voltage in each circuit is V = 10 V and the unit of resistance is R = 8 Ω. Determine (a) the power supplied to each resistor and (b) the current delivered to each resistor.

• physics -

You say each circuit has one resistor.
(a) The power in that resistor is
P = V^2/R
(b) The current in the resistor is
I = V/R

V is either 10 or 20 volts, depending upon the circuit.

R is either 8 or 16 Ù, depending upon the circuit.

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