Alternating current

Question 1 of 10

What is the frequency of the mains supply in Ghana?

Question 2 of 10

A series circuit has R = 30 Ω and XL = 40 Ω. The impedance is

Question 3 of 10

In a series RL circuit with R = 6 Ω and XL = 8 Ω, the power factor is

Question 4 of 10

At resonance in an RLC series circuit, the impedance is

Question 5 of 10

Transformers work only with alternating current because

Question 6 of 10

A transformer with 100 primary turns and 500 secondary turns has a 20 V input. The output is

Question 7 of 10

A 100 Ω resistor, 0.5 H inductor and 20 μF capacitor are in series at 50 Hz. The inductive reactance is about

Question 8 of 10

An alternating voltage has a peak value of 340 V. What is its r.m.s. value?

Question 9 of 10

The resonant frequency of an LC circuit is given by

Question 10 of 10

The r.m.s. value of an alternating voltage with peak 100 V is about