Question 1 of 10
What is the formula for calculating power (P) in a DC circuit?
In DC circuits, power is calculated by multiplying voltage and current (P = V x I).
Question 2 of 10
What does 'Cos?' represent in AC power calculations?
Cos? represents the power factor, which is the ratio of real power to apparent power in an AC circuit.
Question 3 of 10
What is the formula for calculating power in a single-phase AC circuit?
In a single-phase AC circuit, power is calculated as P = V x I x Cos?.
Question 4 of 10
What is the formula for calculating power in a three-phase AC circuit with line-to-line voltage?
In a three-phase AC circuit with line-to-line voltage, power is calculated as P = ?3 x V x I x Cos?.
Question 5 of 10
What is the power factor of a purely resistive load?
A purely resistive load has a power factor of 1 because the voltage and current are in phase.
Question 6 of 10
What is the unit of measurement for power?
The unit of measurement for power is the Watt (W).
Question 7 of 10
If a 120V AC circuit has a current of 2A and a power factor of 1, what is the power consumed?
Using the formula P = V x I x Cos?, P = 120V x 2A x 1 = 240W.
Question 8 of 10
What is the formula to calculate power using only current and resistance?
Power can also be calculated using current and resistance: P = I^2 * R, which is derived from Ohm's Law and the basic power formula.
Question 9 of 10
What is the power factor of an incandescent lamp?
Incandescent lamps have a power factor of 1.0 because they primarily consist of resistive loads.
Question 10 of 10
What is the equivalent power in watts for 230V AC with 10A current and a power factor of 1?
Using the formula P = V x I x Cos?, P = 230V * 10A * 1 = 2300W.
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