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You are hired by someone to design a charger circuit for his cell phone. Design a cell
phone charger cell phone requires exactly 5V and 2A for one hour
to be completely charged. charging circuit by only using the components listed in Table 1. For circuit design and calculations
purposes, the cell phone can be treated as resistor. Use the symbol of rectangle to show the cell phone in
your circuit.
table 1
Equipment Value Quantity
Resistor 500Ω 15
Capacitor 0.2 F 15
Switch SPST 15
Bulb 2.5W, 0.5A 15
Voltage Sources 1.5V 2
A parallel resonant circuit has a capacitor 100pF in one branch and the impedance of 100 micro Henry plus a a resistance of 10 ohms in another parallel branch, calculate:
(a) resonant frequency
(b) impendance of the circuit at the resonance and the line current at resonance
(c) Q-quality factor of the circuitry
4^(×)+4^(×+1)+3=0
Simplify
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Circuit diagram of a wheatstone brigde in which Resistance 1=Resistance 2=Resistance 3=Varrying Resistance 4 = 1000ohms and Emf =20volts. The galvanometer can detect as low as 0.1milliamperes. Determine;
- Internal resistance of the bridge being measured across the terminal.
- Output voltage due to unbalanced conditions.
- Current through the galvanometer for unbalanced conditions.
Small charge in the resistance that can be detected.
.
A solenoid, 1.2meters long is uniformly wound with 800 turns.A search coil of mean diameter 30millimeter wound with 50 turns, is place at the center of the solenoid and connected to a ballastic galvanometer.The total resistance of the search coil circuit is 2000ohms. When a current of 5ampere through the solenoid is reversed, the deflection on the galvanometer scale is 85 division. Taking free space permeability 4π×10^-7Hm. Determine the ballastic constant of the galvanometer in coulombs per unit deflection?
How can I decrease Voltage in this circuit to 220 volts output?
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Circuit diagram of ammeter-voltmeter method of unknown resistance measurement. The voltmeter has a resistance of 5000 ohms and the full scale current of the ammeter is 1ampere. The accuracy of ammeter-voltmeter is +or - 0.5% at full scale. In the measurement the reading were 0.55ampere and 37.6ampere. calculate, 1.measured value of the resistors.
2. Calculate true value of the resistor
3.calculate error in ammeter reading
4. Calculate percentage error in ammeter reading at 0.55ampere
