Understanding Ohm's Law and Power Calculations

What does Ohm's Law describe?

• The relationship between mass, acceleration, and force

• The relationship between voltage, current, resistance, and power

• The relationship between speed, distance, and time

• The relationship between energy, work, and power

What is the formula for calculating power using the power wheel?

• P = V * R

• P = V / I

• P = I / V

• P = I * V

If you need to find the voltage using the power wheel, which formula would you use?

• E = I * R

• E = P * I

• E = P / I

• E = I / P

In the example given, how many 400-watt light poles can be safely connected to a 20-amp circuit considering continuous load limits?

• Seven

• Six

• Five

• Four

Why should you not load a circuit beyond 80% of its rating?

• To save energy

• To reduce electricity bills

• To prevent overheating and ensure safety

• To increase the lifespan of the circuit