Question
What is the formula used to calculate electrical power (P) in a DC circuit?
Answer Options
- A) P = E x I
- B) P = E / I
- C) P = E – I
- D) P = E + I
Correct Answer: A
Explanation
The fundamental relationship used to calculate electrical power (\text{P}) in a \text{DC} circuit, often known as the power law or Joule’s Law, is: P = E \times I.
Power (\text{P}, in Watts) is equal to Voltage (\text{E}, in Volts) multiplied by Current (\text{I}, in Amperes). This formula is essential for calculating power consumption (T4A01) or power output, and it shows that power increases linearly with both voltage and current.
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