Understanding Electric Current Concepts

What is Ohm's Law formula?

• V = R / I

• R = V - I

• V = I * R

• I = V + R

If a resistor has a voltage of 10V and a current of 2A, what is its resistance?

• 20Ω

• 2Ω

• 5Ω

• 10Ω

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

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

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

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

• 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 increases.

• The total current decreases.

• The total current remains the same.

• The total current fluctuates randomly.

Calculate the total resistance of three 4-ohm resistors in series.

• 4 ohms

• 12 ohms

• 8 ohms

• 16 ohms

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

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

• The total resistance is greater than the largest individual resistance.

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

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

What happens to the total current in a parallel circuit when more branches are added?

• The total current decreases.

• The total current remains the same.

• The total current fluctuates randomly.

• The total current increases.

Calculate the total resistance of three 6-ohm resistors in parallel.

• 6 ohms

• 18 ohms

• 2 ohms

• 3 ohms

What is the formula for electrical power?

• P = V - I

• P = V + I

• P = I / V

• P = V × I

If a device uses 100W of power at 220V, what is the current flowing through it?

• 0.2A

• 0.4545A

• 1.5A

• 0.227A