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WorksheetsELECTRICITY- PROBLEMS(REVISION)
Total questions: 36
Worksheet time: 3hrs 0mins
A wire of length 3 m and area of cross-section 1.7 × 10-6 m2 has a resistance 3 × 10-2 ohm.
Calculate the resistivity of the wire
(a)
Two bulbs have ratings 100 W, 220 V and 60 W, 220 V respectively. Which one has a greater resistance?
(a)
Calculate the resistance of 1 km long copper wire of radius 1 mm. (Resistivity of copper = 1.72 x 1 0-8Ohm-m
(a)
How much work is done in moving 4 C across two point having pd. 10 v
(a)
How much energy is given to each coulomb of charge passing through a 9 v battery?
(a)
100 j of work is done in moving a charge of 5 C from one terminal of battery to another . What is the potential difference of battery?
(a)
If 4 x 10 -3 J of work is done in moving a particles carrying a charge of 16 x 10 - 6 C from infinity to point P .What will be the potential at a point?
(a)
Calculate the resistance of a 100 W ,200V electric bulb.
(a)
Calculate the current of a 100 W ,200V electric bulb.
(a)
Calculate the power rating of the heater coil when used on 220V supply taking 5 Amps
(a)
Calculate the work done in moving a charge of 5 coulombs from a point at a potential of 210 volts to another point at 240 volts
(a)
How many electrons pass through a lamp in one minute if the current be 220 mA?
(a)
Calculate the current supplied by a cell if the amount of charge passing through the cell in 4 seconds is 12 C ?
(a)
How much current will an electric heater coil draw from a 220 V source, if the resistance of the heater coil is 100 Ω?
(a)
A 4 Ω resistance wire is doubled on it. Calculate the new resistance of the wire.
(a)
3.A circuit is made of 0.4 Ω wire,a 150Ω bulb and a 120Ω rheostat connected inseries. Determine the total resistance of the resistance of the circuit.
(a)
A current of 0.2 Ampere flows through a conductor of resistance 4.5 Ω. Calculate the potential difference at the ends of the conductor.
(a)
How much power is dissipated when 0.2 ampere of current flows through a 100-ohm resistor?
(a)
The filament of an electric bulb ,which draws a current of 0.25 A is used for two hour. Calculate the amount of charge flowing through the circuit
1200 C
2500 C
900 C
1800 C
If the amount of electric charge passing through a conductor in 4 minutes is 500 C, then the current flowing is
1.8 A
2 A
0.8 A
0.2 A
Work done in moving a charge of 4 C across two points having a potential difference 6 V is
1.5 J
10 J
24 J
2.4 J
The three resistor of resistance 2 Ω, 4 Ω , 6 Ω are connected in series then their effective resistance is
0.9 Ω
14 Ω
9 Ω
12 Ω
The three resistor of resistance 2 Ω, 3 Ω , 6 Ω are connected in parallel then their effective resistance is
11 Ω
9 Ω
1 Ω
4 Ω
The resistance of conductor is 27 Ω , if it is cut into three equal parts and connected in parallel, then the total resistance is
6 Ω
3 Ω
9 Ω
27 Ω
200 J of heat is produced each second in a 2 Ω resistance, then the current in the circuit is
10 A
5 A
14 A
15 A
An electric motor takes 5 A from 220 V line, then the power of electric motor is
1000 W
900 W
1100 W
750 W
An electric heater is rated 4 kWh, electrical energy cost Rs 4 per kWh, what is the cost of using the heater for 2 hours?
Rs 16
Rs 32
Rs 18
Rs 10
In the given circuit, value of R is
12 Ω
14 Ω
2 Ω
4 Ω
In the given combination of resistance , the effective resistance across A and B
5 Ω
7 Ω
13 Ω
16 Ω
An electric iron of resistance 20 Ω and takes current of 5 A, then the Heat developed in 30 seconds
25000 J
15000 J
1500 J
2500 J
An electric iron box rated 750 W Operated for 2 hours per day, if the cost of unit Is Rs 3.00 per kWh, then the cost of energy used to operate electric iron box for 30 days is
Rs 125
Rs 308
Rs 135
Rs 185
What is the total resistance (RT) across this circuit?
3 kΩ
10 kΩ
13 kΩ
18 kΩ
The current going through the 45 ohm resistor is
0.05 amps
0.2 amps
0.1 amps
5 amps
