Electrical Power Chapter 4 Quiz

What is power?

• Power is the same as voltage.

• Power is a type of energy.
• Power is the force applied to an object.
• Power is the rate of doing work.

How do you calculate Power if Voltage and Current are known?

• P = I - V
• P = V + I
• P = V × I
• P = V / I

Convert 3KW to W

• 300 W
• 3000 W
• 30 W
• 3,000,000 W

What happens to Power if Resistance is increased?

• Power increases if resistance is increased.
• Power is unaffected by changes in resistance.
• Power remains constant regardless of resistance changes.
• Power decreases if resistance is increased.

What is the unit of power?

• Joule

• Watt

• Newton

• Volt

If the current is doubled while the Resistance remains constant, what happens to the power?

• Power is halved.

• Power remains the same.

• Power is doubled.

• Power is quadrupled.

What can happen if you leave an extension lead coiled when in use?

• Enhanced durability of the cable.
• Improved signal strength.
• Increased power efficiency.
• Overheating and potential fire hazard.

What do you need to find any of the four electrical quantities?

• Only one electrical quantity is needed.
• A calculator to perform the calculations.
• Knowledge of electrical safety standards.
• At least two of the other electrical quantities.

What happens to Current if Resistance increases?

• Current decreases if resistance increases.
• Current increases if resistance increases.
• Current remains the same if resistance increases.
• Current fluctuates randomly with resistance changes.

What happens to Power if Voltage increases?

• Power increases if Voltage increases.
• Power is unaffected by changes in Voltage.
• Power remains constant regardless of Voltage changes.
• Power decreases if Voltage increases.