A capacitor is connected to a 20 V battery through a resistance of 1092. It is found that the potential difference across the capacitor rises to 2 V in 1 µs. The capacitance of the capacitor is ……….………………………..µF. Given: In (1) = |=0.105
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- An electrical technician requires a capacitance of 2 µF in a circuit across a potential difference of 1 kV. A large number of 1 µF capacitors are available to him each of which can withstand a potential difference of not more than 400 V. Suggest a possible arrangement that requires the minimum number of capacitors.Three capacitors of 4µF, 5µF and 7µF are connected in parallel across a batteryof 60 V. Find a) the equivalent capacitance, b) the total charge on the equivalent capacitor, c) th voltage drop across each capacitor.Three capacitors of capacitances 2 μF, 4 µF, and 6 µF are connected in parallel. (a) Find the capacitance of the combination. (b) If the combination is connected to a battery of an EMF of 110 V, find the charge on each condenser.
- Suppose you are given several capacitors whose capacitances are within the range 12 to 50 nF.You connect all the capacitors in series and let your three partners measure the equivalent capacitance. Three different measurements have been obtained: 8, 44 and 102 nF. Which ofthese three you would assume to be correct?When three identical capacitor are connected in series, their equivalent capacitance is 2 µF. Now they are connected in parallel across a source of e.m.f. 200 V. The total energy stored is.A circuit contains a single 220-pF capacitor hooked across a battery. It is desired to store four times as much energy in a combination of two capacitors by adding a single capacitor to this one. What would its value be?
- (b) Consider a particular phone that has a battery rated at 4,000 mAh. The battery operates at a potential difference of 3.90 V. How much energy, in units of kilowatt-hours, is stored in a fully charged battery? kWh (c) If electricity costs $0.12 (or 12.0 cents) per kilowatt-hour, what is the value of the total amount of energy stored in this battery? Express your answer in cents (or 0.01 of a dollar). ¢ (d) When the phone is idle (that is, turned on but not making calls or texts, using GPS, or running any power-hungry apps), it will operate continuously for 29.2 hours from a fully charged battery, until the battery runs out. How much average current does the phone draw while idle? Express your answer in milliamperes. mACh. 25The Circuit in the figure below has been connected for a long time Let, Ri= 7.6052 and R₂ = 3.80m2 R₁ Joon W To ov R2 2.005 a) ka that is the potential difference across the capacitor? (answer in V) b) It the battery is disconnected from the Circuit, over what time interval des the capacitor discharge to one-fourth its initial voltage (answer in HS) dor 8 M 100MF M