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St Columba’s High School Electricity and Electronics

St Columba’s High School Electricity and Electronics. Capacitors. :30. The ‘coulomb per volt’ is a unit of. Charge Energy Capacitance Potential difference. :30. Capacitors store. Current Charge Voltage Power. :30. Capacitors. Block a.c. but pass d.c Block d.c and a.c.

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St Columba’s High School Electricity and Electronics

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  1. St Columba’s High SchoolElectricity and Electronics Capacitors

  2. :30 The ‘coulomb per volt’ is a unit of • Charge • Energy • Capacitance • Potential difference

  3. :30 Capacitors store • Current • Charge • Voltage • Power

  4. :30 Capacitors • Block a.c. but pass d.c • Block d.c and a.c. • Block d.c. but pass a.c.

  5. :90 An 8 μF capacitor requires • 1 μ C to charge it to 1 V • 8 μC to charge it to 8 V • 8 μC to charge it to 1 V • 8 C to charge it to 8 μV

  6. :30 What does the shaded area under the graph represent ? • The capacitance of the capacitor • The working voltage of the capacitor • The charge stored on the plates of the capacitor • The energy stored in the capacitor

  7. :30 What is represented by the gradient of the graph shown ? • The energy stored by the capacitor • The capacitance of the capacitor • The charge stored • The Current flowing

  8. :90 A 500 μF capacitor has a potential difference of 20 V across it. The charge stored is • 10 μC • 10 mC • 50 mC • 0.04 μC

  9. :90 The energy stored in a 500 μF capacitor charged to a voltage of 20 V is : • 0.005 J • 0.05 J • 0.01J • 0.1 J

  10. :30 A resistor,R, and a capacitor ,C are connected in series.Which graphs are correct for the capacitor charging up ? • A • B • C • D A B C D

  11. :30 As the frequency of the supply is increased from 50 to 5000 Hz the reading on the ammeter will : • Remain constant • Decrease steadily • Increase then decrease • Increase steadily

  12. :90 The maximum value of the current flowing is : • 0 A • 0.5 mA • 0.5 A • 0.005 mA

  13. :30 If the resistance is increased what happens to the time it takes for the capacitor to charge ? • Increases • Stays the same • Decreases

  14. :90 A 25 μF capacitor is charged until the pd across it is 500 V. Calculate the charge stored . • 5.00 x 10-8 C • 2.00 x 10-5 C • 1.25 x10-2 C • 1.25 x 10-4 C

  15. :90 Calculate the energy stored when the pd across the capacitor is 10 V. • 0.4 mJ • 2.5 mJ • 10 mJ • 20 mJ

  16. :30 Which answer describes what happens to the bulbs as the frequency is increased but the output voltage remains constant ? • P brighter Q unchanged • P unchanged Q brighter • P dimmer Q unchanged • P unchanged Q dimmer

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