In the circuit shown below, 0.25 A of current flows through a 20-Ω resistor. How much voltage is needed to produce this current? A. 80 V
B. 0.013 V
C. 19.75 V
D. 5 V

Atoaster oven has a resistive heating element. the average rate at which it dissipates energy as thermal energy is 1.00 \(\rm kw\). in the united states, emf amplitude in household circuits is \(\mathcal e_{\max}\) = 170 \({\rm \; v}\) and the \(\rm ac\) oscillation rate is 60 \(\rm hz\). part a what is the root-mean-square current through the heating element?