Calculate the power used by a circuit that draws a current of I = 3.00 A from a voltage source of V = 21.0 V. 441 W 21.0 W 63.0 W 1.29 W Calculate the power used by a circuit that has a resistance of R = 18.00 Ω and draws a current of I = 0.167 A. 0.00926 W 0.500 W 0.167 W 2.00 W Calculate the power used by a circuit that has a resistance of R = 2.00 Ω with a voltage source of V = 6.00 V. 108 W 54.0 W