Physics 9702 · AS & A Level · Characteristics of alternating currents

Characteristics of alternating currents — practice question

Fig. 6.1 shows how the output V of an alternating voltage supply with frequency 50\,\text{Hz} varies as time t passes.
(a(i))[2]

State the time t_1 from Fig. 6.1.

(a(ii))[1]

State the peak voltage V_0 of the voltage from Fig. 6.1.

(a(iii))[1]

State the root-mean-square voltage V_{\text{rms}} from Fig. 6.1.

(a(iv))[1]

State the mean voltage \langle V \rangle from Fig. 6.1.

(b)[2]

The alternating supply is connected in series with a resistor of resistance 2.4\,\Omega. Calculate the mean power dissipated in the resistor.

Worked solution & mark scheme

This 7-mark question has a full step-by-step worked solution and mark scheme. One marking point: T = \dfrac{1}{50}

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