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Electric Circuits
Explain the working of synchronous counter.
Electric Circuits
Discuss the use of signal generator circuits in the functioning of a CRO .
Electric Circuits
A coil of wire has a resistance of 25.0Ω at 20oC and a resistance of 25.1Ω at 35oC
What is its temperature coefficient of of resistance?
4.5×10−4/oC
$3.5×10−3/oC
2.6×10−4/oC
4.0×10−5/oC
What is its temperature coefficient of of resistance?
4.5×10−4/oC
$3.5×10−3/oC
2.6×10−4/oC
4.0×10−5/oC
Electric Circuits
A copper wire has resistance of 2.0Ω at 0oC and 2.26Ω at 30oC. What is its resistance at 50oC ?
2.43Ω
3.34Ω
1.52Ω
5.31Ω
2.43Ω
3.34Ω
1.52Ω
5.31Ω
Electric Circuits
A wire with resistance of
8.0Ω
is drawn out through a die so that its new length is three times its original length. Find the resistance of the longer wire assuming that the resistivity and density of the material are unaffected by the drawing process.
72Ω
60Ω
80Ω
45Ω
8.0Ω
is drawn out through a die so that its new length is three times its original length. Find the resistance of the longer wire assuming that the resistivity and density of the material are unaffected by the drawing process.
72Ω
60Ω
80Ω
45Ω
Electric Circuits
An ammeter is suspected of giving inaccurate readings. In order to confirm the readings, the ammeter is connected to a silver votltameter in series and a steady current is passed for one hour. The ammeter reads 0.56A and 2.0124g of silver is deposited. Which reading is right?
0.06A
0.11A
1.1A
6.0A
0.06A
0.11A
1.1A
6.0A
Electric Circuits
A cirrent flows in a wire of circular cross-section with the free electrons travelling with a mean drift velocity v. If an equal current flows in a wire of the same material but of twice theradius, what is the new mean drift velocity?
v/4
v/2
2v
4v
v/4
v/2
2v
4v
Electric Circuits
A battery has emf 13.2V and internal resistance 24m . If the load current is 20.0A, find the terminal voltage o f the battery
12.7V
14.5V
16.8V
17.7V
12.7V
14.5V
16.8V
17.7V
Electric Circuits
Electrical energy is sold by PHCN in units of kilowatt-hour (kWh). The lighting of a house is done with five 60W bulbs which are swithed on for approximately three hours per day. What is the lighting bill for the household over a period of 30days at the rate of N1.20 per kilowatt-hour?
N1.50
N25.30
N32.40
N52.20
N1.50
N25.30
N32.40
N52.20
Electric Circuits
A battery charger supplies 10 A to charge a storage battery which has an open - circuit voltage of 5.6 V. If the voltmeter connected across the charger reads 6.8V, what is the internal resistance of the battery at this time?
1.3Ω
0.52Ω
0.12Ω
2.1Ω
1.3Ω
0.52Ω
0.12Ω
2.1Ω
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