A student in the laboratory connects a11 Ω resistor, a 28 Ω resistor, and a 33 Ω resistor in series and then connects the arrangement to a 56-V dc source. (a) How much current is in the circuit?(         ) A(b) How much power is expended in the circuit?(          ) W

In the circuit diagram R1 = 5R and R2 = 15R, where R = 14 Ω. The power dissipated in resistor 2 is P = 1.6 W.  Part (a)  What is the voltage across the battery in volts?  Part (b)  How much power, Ps, is the source supplying, in watts?

Ginko has two parallel plates which are uncharged. They are connected to the RC circuit shown below. Ginko knows the following things abaout this RC cuircuit: The C1 capacitor is filled with air, The C1 capacitor has a plate area of 6cm^2, The C1 capacitor has a plate seperation of 0.500mm, The C2 capacitor is filled with with cardborad that has a dielectric constant of 3.7, The C2 capacitor has the same separation as C1, The C2 capacitor has twice the plate area of C1, The switch remained at a for a long time and then was throuwn to b. Figure out the final charge on each capacitor. b C₂ C₁ 18.0 V 2.00 kn Ginko

If one wants to design a 1500 W electrical heater that consists of a resistor R with V = 208 V across it, what value should be chosen for R?