Alternating current circuits

Question 1 of 10

The peak voltage V₀ is related to the r.m.s. voltage by

Question 2 of 10

An a.c. supply has an r.m.s. voltage of 20 V. Its peak voltage, to 1 decimal place, is ___ V.

Question 3 of 10

An a.c. supply has an r.m.s. voltage of 230 V. Its peak voltage, to 1 decimal place, is ___ V.

Question 4 of 10

An a.c. supply has an r.m.s. voltage of 240 V. Its peak voltage, to 1 decimal place, is ___ V.

Question 5 of 10

Find the reactance of a 100 μF capacitor at 50 Hz, to 1 decimal place.

Question 6 of 10

The unit of inductance is the

Question 7 of 10

A series circuit contains a resistor of 60 Ω, an inductor of reactance 100 Ω and a capacitor of reactance 40 Ω, connected to a 200 V r.m.s. a.c. supply. Calculate (a) the impedance, (b) the r.m.s. current, (c) the p.d. across each component, (d) the phase angle between current and supply voltage.

Question 8 of 10

In a purely inductive circuit, the current

Question 9 of 10

A series circuit contains a resistor of 40 Ω, an inductor of reactance 80 Ω and a capacitor of reactance 60 Ω, connected to a 100 V r.m.s. a.c. supply. Calculate (a) the impedance, (b) the r.m.s. current, (c) the p.d. across each component, (d) the phase angle between current and supply voltage.

Question 10 of 10

At resonance, the current in a series RLC circuit is a maximum.