Electrical Circuits: Master the Fundamentals of Electricity

Question 1

Which formula is used to calculate the total resistance in a parallel circuit?

Accepted Answer

1/R_T = 1/R_1 + 1/R_2 + 1/R_3

Answer

R_T = R_1 + R_2 + R_3

Answer

R_T = (R_1 * R_2 * R_3) / (R_1 + R_2 + R_3)

Answer

R_T = √(R_1^2 + R_2^2 + R_3^2)

Question 2

What happens to the current flow in a circuit when the resistance is increased?

Accepted Answer

Decreased current flow

Answer

Reversed current flow

Answer

No change in current flow

Answer

Increased current flow

Question 3

In a series circuit, the total resistance (R_total) is determined by:

Accepted Answer

Adding the resistance of each component (R_1 + R_2 + ... + R_n)

Answer

Multiplying the resistance of each component (R_1 * R_2 * ... * R_n)

Answer

Subtracting the resistance of each component (R_1 - R_2 - ... - R_n)

Answer

Dividing the resistance of each component (R_1 / R_2 / ... / R_n)

Question 4

In a parallel circuit, the total current (I_total) is:

Accepted Answer

The sum of the currents through each branch (I_1 + I_2 + ... + I_n)

Answer

The difference of the currents through each branch (I_1 - I_2 - ... - I_n)

Answer

The quotient of the currents through each branch (I_1 / I_2 / ... / I_n)

Answer

The product of the currents through each branch (I_1 * I_2 * ... * I_n)

Question 5

Which instrument is primarily used to measure electrical current?

Accepted Answer

Ammeter

Answer

Ohmmeter

Answer

Capacitance meter

Answer

Voltmeter

Question 6

Ohm's Law states that the voltage (V) across a conductor is:

Accepted Answer

Directly proportional to the current (I) flowing through it

Answer

Inversely proportional to the current (I) flowing through it

Answer

Independent of the current (I) flowing through it

Question 7

A resistor with a resistance of 10 ohms is connected to a battery with a voltage of 10 volts. What is the current (I) flowing through the resistor?

Accepted Answer

1 amp

Answer

0.1 amp

Answer

100 amps

Answer

10 amps

Question 8

Which of the following is a type of combination circuit?

Accepted Answer

Series-parallel

Answer

Parallel-series

Answer

Series-only

Answer

Parallel-only

Question 9

Kirchhoff's Current Law states that the total current entering a junction is:

Accepted Answer

Equal to the total current leaving the junction

Answer

Less than the total current leaving the junction

Answer

Independent of the total current leaving the junction

Answer

Greater than the total current leaving the junction

Question 10

Which of the following components primarily stores electrical energy?

Accepted Answer

Capacitor

Answer

Diode

Answer

Resistor

Answer

Inductor

Question 11

In an AC circuit, the voltage and current:

Accepted Answer

Vary sinusoidally with time

Answer

Vary randomly with time

Answer

Remain constant with time

Answer

Vary linearly with time

Question 12

In a series circuit, if one resistor fails (breaks), what happens to the rest of the circuit?

Accepted Answer

The entire circuit will break, and no current will flow.

Answer

The current will decrease through the remaining resistors.

Answer

The other resistors will continue to operate normally.

Question 13

In a parallel circuit, what happens to the total resistance as you add more resistors?

Accepted Answer

The total resistance decreases.

Answer

The total resistance remains the same.

Answer

The total resistance increases.

Question 14

Which of the following is NOT a common unit of measurement for electrical power?

Accepted Answer

Ampere (A)

Answer

Horsepower (hp)

Answer

Watt (W)

Answer

Kilowatt (kW)

Question 15

What type of circuit is typically used in household wiring?

Accepted Answer

Parallel circuit

Answer

Combination circuit

Answer

Open circuit

Answer

Series circuit

Question 16

What is the primary function of a fuse in an electrical circuit?

Accepted Answer

To protect the circuit from overcurrents.

Answer

To store electrical energy.

Answer

To increase the voltage in the circuit.

Answer

To regulate the current flow in the circuit.

Question 17

A circuit with a combination of series and parallel resistors requires careful analysis to determine the overall resistance. How would you approach this type of circuit?

Accepted Answer

Simplify the parallel sections first, then combine the resulting resistances in series.

Answer

Treat all resistors as if they were in parallel.

Answer

Treat all resistors as if they were in series.

Question 18

A circuit has a resistance of 10 ohms and a current of 2 amps. What is the voltage across the circuit?

Accepted Answer

20 volts

Answer

5 volts

Answer

0.2 volts

Answer

20 ohms

Question 19

Which of the following statements is true about a series circuit?

Accepted Answer

The current is the same at all points in the circuit.

Answer

The voltage is the same across all components.

Answer

The total resistance is less than the resistance of any individual component.

Question 20

In a parallel circuit, if one branch has a resistance of 10 ohms and the other has 20 ohms, what is the total resistance of the circuit?

Accepted Answer

6.67 ohms

Answer

30 ohms

Answer

15 ohms

Answer

5 ohms

Question 21

What is the power dissipated by a resistor with a voltage of 12 volts and a current of 2 amps flowing through it?

Accepted Answer

24 watts

Answer

0.5 watts

Answer

6 watts

Question 22

Which of the following is the correct unit for electrical current?

Accepted Answer

Amperes

Answer

Volts

Answer

Watts

Answer

Ohms

Question 23

A circuit has two resistors in parallel, each with a resistance of 10 ohms. What is the equivalent resistance of the circuit?

Accepted Answer

5 ohms

Answer

10 ohms

Answer

20 ohms

Answer

2.5 ohms

Question 24

What happens to the total resistance in a series circuit when an additional resistor is added?

Accepted Answer

It increases.

Answer

It depends on the value of the added resistor.

Answer

It remains the same.

Answer

It decreases.

Question 25

Which of the following devices is used to measure electrical current?

Accepted Answer

Ammeter

Answer

Voltmeter

Answer

Ohmmeter

Answer

Multimeter

Question 26

What is the total voltage across three resistors connected in series, with individual voltage drops of 5V, 10V, and 15V?

Accepted Answer

30V

Answer

20V

Answer

15V

Answer

5V

Question 27

A circuit has a total resistance of 20 ohms and a voltage of 10 volts applied. What is the current flowing through the circuit?

Accepted Answer

0.5 amps

Answer

0.05 amps

Answer

2 amps

Answer

200 amps