Electricity

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.

• V = I * R

• I = V + R

• R = V - I

• V = R / I

If the voltage is 12V and the resistance is 4Ω, what is the current?

• 6A

• 2A

• 3A

• 4A

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

• The total resistance decreases.

• The total resistance fluctuates randomly.

• The total resistance increases.

• The total resistance remains the same.

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

• R_total = R1 - R2 - ... - Rn

• R_total = R1 * R2 / (R1 + R2)

• R_total = R1 + R2 + ... + Rn

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

What is the relationship between voltage, current, and resistance?

• Current is independent of voltage and resistance.

• Voltage is equal to current multiplied by resistance (V = I * R).

• Voltage is the same as current.

• Resistance is equal to voltage divided by current (R = V / I).

Define electric power and provide its formula.

• P = I² × R

• P = V + I

• P = V² / R

• P = V × I

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

• 1A

• 0.5A

• 0.25A

• 2A

What is the unit of resistance?

• Joule

• Ohm

• Watt

• Volt

Explain the difference between conductance and resistance.

• Conductance is the reciprocal of resistance; conductance measures how easily current flows, while resistance measures how much it opposes current flow.

• Conductance and resistance are the same concept.

• Resistance measures voltage while conductance measures current.

• Conductance is only relevant in AC circuits, while resistance applies to DC circuits.