ACSEE (Form 6) Current Electricity — practice questions

Explore 5 free Current Electricity questions in ACSEE (Form 6) Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Current Electricity questions and exercises with answers

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The two conservation laws embodied in Kirchhoff's rules are conservation of:Read the answer and worked solution →The reactance of a capacitor $C$ at frequency $f$ in an a.c. circuit is:Read the answer and worked solution →Match the rule to its conservation lawRead the answer and worked solution →Which is greater?Read the answer and worked solution →Order the Kirchhoff methodRead the answer and worked solution →

Worked practice questions

The two conservation laws embodied in Kirchhoff's rules are conservation of:

energy at a junction and charge round a loop
mass at a junction and momentum round a loop
charge at a junction and energy round a loop
momentum at a junction and mass round a loop

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Correct answer: C. charge at a junction and energy round a loop

1. Kirchhoff's first rule says the currents entering a junction equal those leaving it. 2. Since current is charge per unit time, that rule expresses conservation of charge. 3. Kirchhoff's second rule says the potential differences around any closed loop sum to zero. 4. Potential difference is energy per unit charge, so that rule expresses conservation of energy. 5. The pairing matters: charge goes with the junction rule and energy with the loop rule, not the reverse. _Source: NECTA ACSEE 2023 Physics 131/1, Question 8: Current Electricity_

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The reactance of a capacitor $C$ at frequency $f$ in an a.c. circuit is:

$X_C=2\pi fC$
$X_C=\dfrac{1}{2\pi fC}$
$X_C=\dfrac{2\pi f}{C}$
$X_C=\dfrac{C}{2\pi f}$

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Correct answer: B. $X_C=\dfrac{1}{2\pi fC}$

1. Capacitive reactance is the opposition a capacitor offers to alternating current. 2. It is given by $X_C=\dfrac{1}{2\pi fC}$. 3. So reactance falls as frequency rises: a capacitor passes high frequencies more easily. 4. For $C=1\ \mu\text{F}$ at $f=1000$ Hz, $X_C\approx159\ \Omega$, and the voltage follows from $V=IX_C$. 5. Writing $X_C=2\pi fC$ inverts the relation and would wrongly predict that a capacitor blocks high frequencies. _Source: NECTA ACSEE 2023 Physics 131/1, Question 8: Current Electricity_

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Match the rule to its conservation law

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Matching pairs

Left
Kirchhoff junction rule
Right
Conservation of charge
Left
Kirchhoff loop rule
Right
Conservation of energy
Left
Newton's first law
Right
Inertia of a body

Instructions

Tap a rule on the left, then the law it expresses.

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