Ohm's Law and Power Calculations Quiz Practice Quiz…

Q: What is the unit of measurement for electric current?

Ampere (A) — Current is measured in Amperes (A), representing the flow of charge.

Q: If a circuit has a voltage of 12V and a resistance of 4?, what is the current flowing through it?

3 A — Using Ohm's Law (I = V/R), I = 12V / 4? = 3A.

Q: What is the formula for calculating electrical power?

P = V x I — Power (P) is calculated as Voltage (V) multiplied by Current (I).

Q: What is the unit of measurement for electrical resistance?

Ohm (?) — Resistance is measured in Ohms (?), representing opposition to current flow.

Q: A resistor has a power rating of 10W. If the voltage across it is 5V, what is the current flowing through it?

2 A — Using P = V*I and rearranging, I = P/V = 10W/5V = 2A.

Q: If a lightbulb draws 0.5A from a 120V source, what is its power consumption?

60 W — Using P = V * I, P = 120V * 0.5A = 60W.

Q: What happens to the current if the voltage is doubled and the resistance remains the same?

It doubles. — Ohm's law dictates a direct proportionality: I = V/R. Doubling V doubles I.

Q: Which of the following represents Ohm's Law?

V = I x R — Ohm's Law states Voltage (V) is equal to Current (I) times Resistance (R).

Q: What is the power dissipated by a 100? resistor carrying a current of 2A?

400 W — Using P = I^2 * R, P = (2A)^2 * 100? = 400W.

Q: If the resistance in a circuit increases, what happens to the current (assuming constant voltage)?

Decreases — According to Ohm's Law (I=V/R), current is inversely proportional to resistance.

Question 1 of 10

What is the unit of measurement for electric current?

Current is measured in Amperes (A), representing the flow of charge.

Question 2 of 10

If a circuit has a voltage of 12V and a resistance of 4?, what is the current flowing through it?

Using Ohm's Law (I = V/R), I = 12V / 4? = 3A.

Question 3 of 10

What is the formula for calculating electrical power?

Power (P) is calculated as Voltage (V) multiplied by Current (I).

Question 4 of 10

What is the unit of measurement for electrical resistance?

Resistance is measured in Ohms (?), representing opposition to current flow.

Question 5 of 10

A resistor has a power rating of 10W. If the voltage across it is 5V, what is the current flowing through it?

Using P = V*I and rearranging, I = P/V = 10W/5V = 2A.

Question 6 of 10

If a lightbulb draws 0.5A from a 120V source, what is its power consumption?

Using P = V * I, P = 120V * 0.5A = 60W.

Question 7 of 10

What happens to the current if the voltage is doubled and the resistance remains the same?

Ohm's law dictates a direct proportionality: I = V/R. Doubling V doubles I.

Question 8 of 10

Which of the following represents Ohm's Law?

Ohm's Law states Voltage (V) is equal to Current (I) times Resistance (R).

Question 9 of 10

What is the power dissipated by a 100? resistor carrying a current of 2A?

Using P = I^2 * R, P = (2A)^2 * 100? = 400W.

Question 10 of 10

If the resistance in a circuit increases, what happens to the current (assuming constant voltage)?

According to Ohm's Law (I=V/R), current is inversely proportional to resistance.

Ohm's Law and Power Calculations Quiz