Electric Circuits
A charge moves through an electric potential difference of . What is the change in electric potential energy, , experienced by the charge?
In a two-loop circuit, the potential rises in the first loop is 20V and the potential drops are due to a 4 and a 6 resistor. In the second loop, there is a 5V battery and three resistors with 2, 4 and 8. Which of the following equations correctly represents Kirchhoff's Loop Rule ...
20 - 4I_1 - 6I_1 = 0
20 + 4I_1 + 6I_1 = 0
4I_1 + 6I_1 = 0
20 - 4I_1 + 6I_1 = 0
Consider a two-loop circuit with two batteries and three resistors. After applying Kirchhoff's Loop Rule and the Junction Rule, you obtain the following system of equations:
10 - 2I_1 - 4I_2 = 0
If , what is the value of ?
3A
4A
5A
6A
What fundamental principle underlies Kirchhoff's Loop Rule?
Conservation of charge
Conservation of momentum
Conservation of energy
Conservation of mass
A circuit consists of a 12V battery connected in series with a 4Ω resistor and a 2Ω resistor. What is the voltage drop across the 4Ω resistor?
4V
6V
8V
12V
Consider a complex multi-loop circuit. After applying both the Loop and Junction rules, you arrive at the following system of equations:
12 - 4I_1 - 2I_2 = 0
6 - 3I_3 + 2I_2 = 0
Solve for , , and .
An electric potential vs. position graph for a circuit loop shows a sudden increase in potential, followed by a gradual decrease. What circuit elements are likely present at these locations?
Resistor followed by a capacitor
Voltage source followed by a resistor
Capacitor followed by an inductor
Inductor followed by a voltage source

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A circuit consists of a battery and a resistor. Which of the following graphs best represents the electric potential vs. position around the loop, starting from the negative terminal of the battery?
A straight horizontal line.
A straight line sloping upwards.
A step up followed by a straight horizontal line.
A step up followed by a straight line sloping downwards.
In a circuit with multiple loops and junctions, which of the following statements correctly applies both the loop and junction rules?
The sum of currents entering a junction equals the sum of voltages in a loop.
The sum of currents leaving a junction equals the sum of voltages entering the junction.
The sum of currents entering a junction equals the sum of currents leaving the junction, and the sum of potential differences around any closed loop is zero.
The sum of potential differences entering a junction equals the sum of potential differences leaving the junction, and the sum of currents around any closed loop is zero.
In a simple circuit containing a 9V battery and a single resistor, what is the voltage drop across the resistor according to Kirchhoff's Loop Rule?
0V
4.5V
9V
18V