Understanding Electricity Concepts

What is Ohm's Law formula?

• V = I * R

• V = R / I

• I = V + R

• R = V - I

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

• 6A

• 4A

• 2A

• 3A

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

• The total resistance is greater than the individual resistances.

• The total resistance is the same as the largest individual resistance.

• The total resistance is equal to the sum of individual resistances.

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

What happens to the total current in a parallel circuit if one branch is disconnected?

• The total current decreases.

• The total current remains the same.

• The total current becomes zero.

• The total current increases.

If two resistors of 6Ω and 3Ω are in series, what is the total resistance?

• 12Ω

• 3Ω

• 9Ω

• 6Ω

How do you calculate the equivalent resistance of resistors in parallel?

• R_eq = R1 * R2 / (R1 + R2)

• R_eq = R1 - R2

• R_eq = 1 / (1/R1 + 1/R2 + ... + 1/Rn)

• R_eq = R1 + R2 + ... + Rn

What is the unit of electrical resistance?

• Watt

• Ampere

• Ohm

• Volt

In a series circuit, does the voltage remain the same across all components?

• Yes, the voltage is the same across all components.

• No, the voltage does not remain the same across all components.

• The voltage varies but only increases across components.

• The voltage is constant and does not change in a series circuit.

What is the effect of adding more resistors in series on the total resistance?

• The total resistance fluctuates randomly.

• The total resistance increases.

• The total resistance decreases.

• The total resistance remains the same.

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

• The voltage is equal to the total voltage of the circuit.

• The voltage is zero across all resistors.

• The voltage across each resistor is different.

• The voltage across each resistor is the same.