Capacitors

1. 1A 10 mF capacitor is charged to 10 V and then discharged completely through a small motor. During this process, the motor lifts a weight of mass 0.10 kg. If 10% of the energy stored in the capacitor is used to lift the weight, through what approximate height will the weight be lifted?

   1. AA 0.05 m
   2. BB 0.10 m
   3. CC 0.50 m
   4. DD 1.00 m
2. 2A capacitor of capacitance C discharges through a resistor of resistance R.
   Which one of the following statements is not true?
   

   1. AA The time constant will increase if R is increased.
   2. BB The time constant will decrease if C increased.
   3. CC After charging to the same voltage, the initial discharge current will increase if R is decreased.
   4. DD After charging to the same voltage, the initial discharge current will be unaffected if C is increased.
3. 3The graph shows how the charge stored by a capacitor varies with the potential difference across it as it is charged from a 6 V battery.
   Which one of the following statements is not correct?

   

   1. AA The capacitance of the capacitor is 5.0 µF.
   2. BB When the potential difference is 2 V the charge stored is 10 µC.
   3. CC When the potential difference is 2 V the energy stored is 10 µJ.
   4. DD When the potential difference is 6 V the energy stored is 180 µJ.

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Test sobre Capacitors, creado por Chris Watson el 09/02/2015.

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Chris Watson

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