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← Topic 21 overviewTOPIC 21 ASSESSMENT

Alternating currents

CIE-style questions assess sinusoidal quantities, r.m.s. values, power, transformers, rectification and smoothing.

Objective question 1

For a sinusoidal voltage, Vᵣₘₛ equals:

Objective question 2

Mean power in a resistor is calculated using:

Objective question 3

An ideal transformer obeys:

Objective question 4

A full-wave bridge rectifier uses:

Objective question 5

Increasing smoothing capacitance generally makes ripple:

Structured question 1

A sinusoidal voltage has peak value 325 V. Calculate its r.m.s. value.

Structured question 2

A 100 Ω resistor is connected to 20 V r.m.s. Calculate mean power.

Structured question 3

A transformer has 1200 primary turns at 240 V and 100 secondary turns. Calculate secondary voltage.