level 3 Electrical installation

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6 Terms

1
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How do you calculate single-phase real power for a resistive load?

P= VxI

or for AC with a power factor

P=V x I X cosɸ

2
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How do you calculate inductive reactance?

XL = 2πfL, in ohms (Ω).

3
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How do you calculate capacitive reactance?

XC = 1/(2πfC), in ohms (Ω).

4
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How do you calculate impedance for a series RLC circuit?

Z = √[R² + (XL − XC)²], in ohms (Ω).

5
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What is the relationship between apparentpower, real power and power factor?

Power factor = P/S, where P is real power in watts and S is apparent power in volt-amperes.

6
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How do you calculate transformer apparent power?

Single phase: S = V × I. Three phase, balanced: S = √3 × VL × IL.