Understanding Current Electricity

What is Ohm's Law and how is it mathematically expressed?

• V = R / I

• I = V + R

• Ohm's Law is mathematically expressed as V = I * R.

• R = V - I

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

• 4A

• 6A

• 2A

• 3A

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

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

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

• The total resistance is greater than the individual resistances.

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

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

• R_total = R1 - R2 - R3 - ... - Rn

• R_total = R1 * R2 * R3 * ... * Rn

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

• R_total = R1 + R2 + R3 + ... + Rn

Define resistance and its unit of measurement.

• Resistance is measured in ohms (Ω).

• Resistance is measured in watts (W).

• Resistance is measured in amperes (A).

• Resistance is measured in volts (V).

What is the relationship between conductance and resistance?

• Resistance is the reciprocal of conductance.

• Conductance increases with higher resistance.

• Conductance is the reciprocal of resistance.

• Conductance is the same as resistance.

How does increasing the voltage affect the current in a circuit according to Ohm's Law?

• Increasing the voltage increases the current in a circuit.

• Voltage has no effect on the current in a circuit.

• Increasing the voltage decreases the current in a circuit.

• Increasing the voltage causes the current to remain constant.

In a series circuit with three resistors of 2Ω, 3Ω, and 5Ω, what is the total resistance?

• 8Ω

• 12Ω

• 10Ω

• 6Ω

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

• 2Ω

• 9Ω

• 4Ω

• 1Ω

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

• The total current remains the same.

• The total current becomes zero.

• The total current decreases.

• The total current increases.