Higher capacitors Quiz

A capacitor is charged and discharged using the circuit below

• A
• B
• C
• D
• E

A circuit is set up as shown. The capacitor is initially uncharged. Switch S is closed.

Which graphs show how the potential difference V_R across resistor R, the potential difference V_C across capacitor C, and the current I in the circuit, vary with time t as the capacitor charges?

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A capacitor and resistor are connected to a supply of EMF E. Which two graphs show the voltages across capacitor Vc and resistor Vr while charging?

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The graph below shows how charge varies as a capacitor is charged to a PD of 10V. Us the graph to determine the energy stored with 10 V across the capacitor.

• 0.4 mJ
• 2.5 mJ
• 10 mJ
• 20 mJ
• 40 mJ

A 15 µF capacitor is charged using a 1·5 V battery.

Calculate the charge stored on the capacitor when it is fully charged.

• 2.25x10^-5 C

• 22.5x10^-6 C

• 22.5 C

• 10 C

• 1x10^-5 C

A 15 µF capacitor is charged using a 1·5 V battery.

Calculate the energy stored by the capacitor when it is fully charged.

• 1.69x10^-5 J

• 1.13x10^-5 J

• 2.25x10^-5 J

• 1.69 J

• 1.13 J

A 50 µF capacitor is charged until the p.d. across it is 100 V.

Calculate the charge on the capacitor when the p.d. across it is 100 V.

• 5x10^-3 C

• 5000 C

• 0.5 C

• 2 C

• 5x10^-4 C

A 50 µF capacitor is charged until the p.d. across it is 100 V.

The capacitor is now ‘fully’ discharged in a time of 4·0 milliseconds. Calculate the average current during this time.

• 1.25 A

• 0.02 A

• 2x10^-5 A

• 0.8 A

• 1.25x10^-3 A

A capacitor stores a charge of 3·0 × 10^–4 C when the p.d. across its terminals is 600 V.

What is the capacitance of the capacitor?

• 5x10^-7 F

• 0.18 F

• 5x10^-3 F

• 200,000 F

• 200 F

A capacitor stores a charge of 3·0 × 10^–4 C when the p.d. across its terminals is 600 V.

What is the energy stored by the capacitor?

• 0.09 J

• 0.18 J

• 1800 J

• 187200 J

• 0.19 J