Understanding Ohm's Law and Circuits

What is Ohm's Law?

• Ohm's Law states that R = V / I.

• Ohm's Law is V = I * R.

• Ohm's Law is I = V + R.

• Ohm's Law defines power as P = I / R.

State the formula for Ohm's Law.

• R = V - I

• V = R / I

• I = V + R

• V = I * R

If a circuit has a voltage of 12V and a current of 3A, what is the resistance?

• 4Ω

• 8Ω

• 6Ω

• 2Ω

How do you calculate total resistance in a series circuit?

• R_total = R1 * R2 * R3 * ... * Rn

• R_total = R1 - R2 - R3 - ... - Rn

• R_total = R1 + R2 + R3 + ... + Rn

• R_total = R1 / R2 / R3 / ... / Rn

What is the total resistance of three 4-ohm resistors in series?

• 12 ohms

• 16 ohms

• 4 ohms

• 8 ohms

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

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

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

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

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

What is the formula for calculating total resistance in a parallel circuit?

• R_total = R1 * R2 * R3 * ... * Rn

• 1/R_total = 1/R1 + 1/R2 + 1/R3 + ... + 1/Rn

• R_total = R1 - R2 - R3 - ... - Rn

• R_total = R1 + R2 + R3 + ... + Rn

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

• 2 ohms

• 1 ohm

• 4 ohms

• 9 ohms

Explain the relationship between voltage, current, and resistance.

• Voltage is independent of resistance.

• Resistance increases with higher current only.

• Voltage, current, and resistance are related by Ohm's Law: V = I * R.

• Voltage is the same as current.

What happens to the current if the resistance is doubled while the voltage remains constant?

• The current remains the same.

• The current is doubled.

• The current increases by 50%.

• The current is halved.