Question 1 of 10
What is the formula for calculating current (I) in a DC circuit?
In DC circuits, current is calculated by dividing power (P) by voltage (V).
Question 2 of 10
What is the formula for calculating current (I) in a single-phase AC circuit?
In AC circuits, the power factor (Cos?) must be considered.
Question 3 of 10
What does 'Cos?' represent in the AC power formula?
Cos? represents the power factor, which accounts for the phase difference between voltage and current in AC circuits.
Question 4 of 10
What is the formula for calculating current (I) in a three-phase AC circuit with line-to-line voltage (VL-L)?
The formula includes the square root of 3 due to the three-phase nature of the circuit.
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 power factor of a typical incandescent lamp?
Incandescent lamps are almost purely resistive, with a power factor close to 1.
Question 7 of 10
What is the power factor for a motor at no load?
Induction motors at no load have a lower power factor.
Question 8 of 10
What is the formula that is derived from Ohm's Law that relates Current, Power and Resistance?
This formula helps relate current to power and resistance when voltage is not known.
Question 9 of 10
If a 600W appliance is connected to a 120V circuit, what is the current draw?
Using I = P / V, the current is 600W / 120V = 5A.
Question 10 of 10
Which of the following would be an appropriate way to input 50000 into a calculator for scientific notation?
For scientific notation, use 5e4 or 5.0e4 or 5 x 10^4
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