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WorksheetsBasic AC Theory
Total questions: 11
Worksheet time: 8mins
The frequency of an alternating electrical system is measured in
cycles
volts
hertz
seconds
A phasor is
part of a three-phase system
a method of representing a sinusoidally varying system
the angle between alternating current and voltage
always measured in radians
The effect which limits current flow in a pure inductor connected to an
alternating-voltage supply is called the
induced EMF
inductive reactance
capacitive reactance
resistance
If a supply at 230V, 50Hz is connected to a 420mH inductor, the current
flow will be
1.74 A
0.57 A
11.4 A
31.6 μA
If a sinusoidal voltage is applied to a pure capacitor
the average current flow will be zero
the current will lead the voltage by 900
the current will lag the voltage by 900
current and voltage will be in phase
An alternating supply of 12V at 1kHz is connected to a capacitor, and
the current is found to be 15mA. The capacitance of the capacitor is
800 Ω
625 nF
50.3 μF
198 nF
The opposition to current flow in an AC resistive circuit is called:
resistance
inductance
reactance
impedance
The opposition to current flow in an AC capacitive or inductive current is
called:
resistance
inductance
reactance
impedance
A straight line having definite length and direction that represents to scale a
quantity such as current voltage or impedance is called:
a series AC circuit
capacitive reactance
a phasor, as in a phasor diagram
the impedance triangle
