Electrical Load Calculation Worksheet
A Grade 9 Science worksheet focusing on understanding and calculating electrical loads in circuits.
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Electrical Load Calculation Worksheet
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Read each question carefully and answer to the best of your ability. Show all your calculations where required.
1. Which of the following is the standard unit for electrical power?
Ampere (A)
Volt (V)
Watt (W)
Ohm (Ω)
2. What is the formula used to calculate electrical power?
P = V/I
P = I/V
P = V * I
P = I * R
3. The total electrical power consumed by all appliances and devices connected to a circuit is known as the .
4. To calculate the total current drawn by multiple devices in a parallel circuit, you need to the individual currents.
5. A television has a power rating of 150 Watts and operates on a 120 Volt circuit. Calculate the current (in Amperes) drawn by the television.
6. Explain why it is important to calculate the total electrical load before adding new appliances to a circuit.
7. Observe the simple electric circuit diagram below. Assume the light bulb has a resistance of 24 Ohms and the battery provides 12 Volts.
a) Calculate the current flowing through the circuit.
b) Calculate the power consumed by the light bulb.
8. Overloading an electrical circuit can cause circuit breakers to trip or fuses to blow.
True
False