Physics

1At resonance in an RLC series circuit, the impedance is

2Transformers work only with alternating current because

3What is the frequency of the mains supply in Ghana?

4An alternating voltage has a peak value of 340 V. What is its r.m.s. value?

5The reactance of an inductor

6A series circuit has R = 30 Ω and XL = 40 Ω. The impedance is

7The r.m.s. value of an alternating voltage with peak 100 V is about

8A transformer with 100 primary turns and 500 secondary turns has a 20 V input. The output is

9In a series RL circuit with R = 6 Ω and XL = 8 Ω, the power factor is

10An inductor of 0.1 H on a 50 Hz supply has a reactance of about