Question 1 of 10
What is the base unit of electrical power?
The watt (W) is the standard unit for measuring electrical power, representing the rate at which work is done or energy is transferred.
Question 2 of 10
1 kilowatt (kW) is equal to how many watts (W)?
The prefix 'kilo' means 'thousand'. Therefore, 1 kW = 1000 W.
Question 3 of 10
Which formula correctly represents the relationship between power (P), voltage (V), and current (I) in a DC circuit?
In DC circuits, power (in watts) is calculated by multiplying voltage (in volts) by current (in amperes).
Question 4 of 10
If a circuit has a voltage of 120V and a current of 2A, what is the power consumption in watts?
Using the formula P = V * I, P = 120V * 2A = 240W
Question 5 of 10
What does the abbreviation 'MW' represent?
MW stands for Megawatt, which represents one million watts.
Question 6 of 10
What is the formula for calculating power (P) using Joules (J) and seconds (s)?
Power is defined as the rate of energy transfer, so Power (Watts) = Joules / Second
Question 7 of 10
If 10,000 Joules of energy are used in 5 seconds, what is the power output in kW?
P = 10000 J / 5 s = 2000 W = 2 kW
Question 8 of 10
In a single-phase AC circuit, what is the formula for power (P), considering voltage (V), current (I), and the power factor (Cos?)?
The power factor (Cos?) accounts for the phase difference between voltage and current in AC circuits.
Question 9 of 10
What is the formula for calculating power (P) in Watts using Amps (I) and Resistance (R)?
This is derived from Ohm's Law (V = I * R) and the power formula P = V * I. Substituting V, we get P = I^2 * R.
Question 10 of 10
How do you convert kW to kVA, given the power factor (Cos?)?
This is the formula to find the real power (kW) using apparent power (kVA) and the power factor (Cos?). kW = kVA * Cos?
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