Electric Circuits
A 5-Ω resistor is connected to a 10-V power supply. How much power is dissipated in the resistor?
10 W
20 W
50 W
100 W
In a multi-loop circuit, what principle does Kirchhoff's Current Law (KCL) describe?
The sum of voltage drops around any closed loop is zero.
The current is the same through each component in a series circuit.
The total current entering a junction equals the total current leaving the junction.
The voltage is the same across each component in a parallel circuit.
What is the primary function of a resistor in an electric circuit?
To store electrical energy.
To limit the flow of current.
To provide energy to the circuit.
To control the direction of current.
Two resistors, one with a resistance of 6 Ω and the other with a resistance of 3 Ω, are connected in parallel. What is the equivalent resistance of the parallel combination?
2 Ω
4.5 Ω
9 Ω
18 Ω
Using Gauss's Law, determine the electric field outside a uniformly charged sphere of radius R with total charge Q at a distance r > R from the center.
E = 0
E = kQ/r
E = kQ/r²
E = kQr/R³
A 9-V battery is connected to a resistor. If the current flowing through the resistor is 3 A, what is the resistance of the resistor?
3 Ω
6 Ω
12 Ω
27 Ω
A resistor has a voltage of 12 V across it and a current of 2 A flowing through it. What is the power dissipated by the resistor?
6 W
14 W
24 W
48 W

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In a circuit, a junction has three branches. Branch 1 has a current of 2 A flowing into the junction, and branch 2 has a current of 3 A flowing into the junction. What is the current in branch 3 if it is flowing out of the junction?
1 A
2 A
3 A
5 A
What is the relationship between the electric flux through a closed surface and the charge enclosed within that surface, according to Gauss's Law?
The electric flux is equal to the enclosed charge.
The electric flux is inversely proportional to the enclosed charge.
The electric flux is proportional to the square of the enclosed charge.
The electric flux is proportional to the enclosed charge divided by the permittivity of free space.
Two resistors, and , are connected in series. What is the equivalent resistance of the combination?
2.4 Ω
5 Ω
10 Ω
24 Ω