In a Loop in a Closed Circuit,the Sum of the Currents
In a loop in a closed circuit,the sum of the currents entering a junction equals the sum of the currents leaving a junction because
A)the potential of the nearest battery is the potential at the junction.
B)there are no transformations of energy from one type to another in a circuit loop.
C)capacitors tend to maintain current through them at a constant value.
D)current is used up after it leaves a junction.
E)charge is neither created nor destroyed at a junction.
The circuit below contains three resistors,A,B,and C,which all have equal resistances.The emf = 110V.Which resistor generates the most thermal energy after the switch is closed?
D)A and B
E)All three generate equal amounts of thermal energy.
In an RC circuit,how many time constants must elapse if an initially uncharged capacitor is to reach 80% of its final potential difference?
How many time constants must elapse if an initially charged capacitor is to discharge 55% of its stored energy through a resistor?