Understanding Current Electricity

What is Ohm's Law formula?

• V = R / I

• I = V + R

• V = I * R

• R = V - I

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

• 6A

• 2A

• 4A

• 3A

In a series circuit, how does the total resistance compare to individual resistances?

• The total resistance is less than the smallest individual resistance.

• The total resistance is the average of the individual resistances.

• The total resistance is equal to the individual resistances.

• The total resistance is greater than the individual resistances.

What happens to the total current in a series circuit when more resistors are added?

• The total current decreases.

• The total current increases.

• The total current remains the same.

• The total current fluctuates randomly.

In a parallel circuit, how does the voltage across each component compare?

• The voltage across each component is different.

• The voltage is zero across all components.

• The voltage varies depending on the component's resistance.

• The voltage across each component is the same.

What is the formula for calculating electrical power?

• P = V + I

• P = I / V

• P = V × I

• P = V - I

If a device uses 60W of power and operates at 120V, what is the current flowing through it?

• 0.5A

• 2A

• 1A

• 0.25A

What is the effect of increasing resistance on current in a circuit?

• Increasing resistance increases the current in a circuit.

• Increasing resistance has no effect on the current in a circuit.

• Increasing resistance causes the current to fluctuate unpredictably.

• Increasing resistance decreases the current in a circuit.

How do you calculate the total resistance in a parallel circuit with two resistors?

• R_total = R1 + R2

• R_total = 1 / (1/R1 + 1/R2)

• R_total = R1 - R2

• R_total = R1 * R2

What is the unit of electrical resistance?

• Ampere

• Volt

• Watt

• Ohm