Question 1

Which of the following best describes the physical meaning of electric current ($I$) in a conductor?

Accepted Answer

The rate at which charge passes a point in a closed circuit.

Question 2

A resistor of $150\ \Omega$ has a potential difference of $3\ \mathrm{V}$ across it. What is the current flowing through the resistor?

Accepted Answer

$0.02\ \mathrm{A}$

Question 3

Which equation correctly relates conductance ($G$) and resistance ($R$)?

Accepted Answer

$G = 1/R$

Question 4

Two resistors, $R_1 = 100\ \Omega$ and $R_2 = 200\ \Omega$, are connected in parallel. What is the total resistance $R_T$ of the combination?

Accepted Answer

$R_T = 66.67\ \Omega$

Question 5

A $6\ \mathrm{V}$ battery is connected across two resistors in series: $R_1 = 100\ \Omega$ and $R_2 = 200\ \Omega$. What is the current flowing through the circuit?

Accepted Answer

$0.03\ \mathrm{A}$

Question 6

Which of the following statements about capacitors is TRUE?

Accepted Answer

The capacitance increases as the area of the plates increases.

Question 7

The formula for the capacitance $C$ of a parallel plate capacitor is:

Accepted Answer

$C = \varepsilon_0 \varepsilon_r A / d$

Question 8

A current of $0.5\ \mathrm{A}$ flows through a resistor of $10\ \Omega$. What is the voltage across the resistor?

Accepted Answer

$5\ \mathrm{V}$

Question 9

Which of the following best explains why the cell membrane can be modeled as a capacitor?

Accepted Answer

Because it stores separated charges on either side, creating a potential difference.

Question 10

If three resistors $R_1 = 100\ \Omega$, $R_2 = 200\ \Omega$, and $R_3 = 300\ \Omega$ are connected in series, what is the total resistance?

Accepted Answer

$600\ \Omega$

Question 11

A capacitor is connected to a battery and allowed to fully charge. What happens to the current in the circuit once the capacitor is fully charged?

Accepted Answer

The current drops to zero.

Question 12

Which of the following is the correct SI unit for conductance?

Accepted Answer

Siemens (S)

Question 13

A potential difference of $1.5\ \mathrm{V}$ is applied across a resistor of $150\ \Omega$. What is the current in milliamperes (mA)?

Accepted Answer

$10\ \mathrm{mA}$

Question 14

Which of the following statements about resistors in parallel is correct?

Accepted Answer

The total resistance is less than the smallest individual resistance.

Question 15

A nerve cell membrane has a resistance of $30\ \mathrm{M}\Omega$ and a current of $0.5\ \mathrm{nA}$ is injected. What is the change in membrane potential ($V$)?

Accepted Answer

$15\ \mathrm{mV}$

Question 16

Which of the following best describes the process of charging a capacitor in a circuit?

Accepted Answer

Charge accumulates gradually, following an exponential curve.

Question 17

If the area of the plates in a parallel plate capacitor is doubled while the distance between them remains constant, what happens to the capacitance?

Accepted Answer

It is doubled.

Question 18

Which of the following is NOT a correct electrical symbol and its meaning?

Accepted Answer

A pair of parallel lines of equal length represents a switch.

Question 19

A circuit contains two resistors, $R_1 = 400\ \Omega$ and $R_2 = 500\ \Omega$, in series connected to a $9\ \mathrm{V}$ battery. What is the current in the circuit?

Accepted Answer

$0.01\ \mathrm{A}$

Question 20

Which of the following best describes the effect of adding a resistor in parallel to an existing resistor?

Accepted Answer

The total resistance decreases.

Electrical Properties: Current, Resistance, Ohm's Law, and Capacitors

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