numericals related to charges on electricity
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1. Question: Two bulbs have ratings 100 W, 220 V and 60 W, 220 V respectively. Which one has a greater resistance?
2. Question: A torch bulb has a resistance of 1 Ω when cold. It draws a current of 0.2 A from a source of 2 V and glows. Calculate
(i) the resistance of the bulb when glowing and
(ii) explain the reason for the difference in resistance.
3. Question: Calculate the resistance of 1 km long copper wire of radius 1 mm. (Resistivity of copper = 1.72 x 1 0-8
4. Question: When a potential difference of 2 V is applied across the ends of a wire of 5 m length, a current of 1 A is found to flow through it. Calculate:
(i) the resistance per unit length of the wire
(ii) the resistance of 2 m length of this wire
(iii) the resistance across the ends of the wire if it is doubled on itself.
5. How much work is done in moving 4 C across two point having pd. 10 v
6. How much energy is given to each coulomb of charge passing through a 9 v battery?
7. 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?
8. 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?
9. Calculate the current and resistance of a 100 W ,200V electric bulb.
10.Calculate the power rating of the heater coil when used on 220V supply taking 5 Amps
2. Question: A torch bulb has a resistance of 1 Ω when cold. It draws a current of 0.2 A from a source of 2 V and glows. Calculate
(i) the resistance of the bulb when glowing and
(ii) explain the reason for the difference in resistance.
3. Question: Calculate the resistance of 1 km long copper wire of radius 1 mm. (Resistivity of copper = 1.72 x 1 0-8
4. Question: When a potential difference of 2 V is applied across the ends of a wire of 5 m length, a current of 1 A is found to flow through it. Calculate:
(i) the resistance per unit length of the wire
(ii) the resistance of 2 m length of this wire
(iii) the resistance across the ends of the wire if it is doubled on itself.
5. How much work is done in moving 4 C across two point having pd. 10 v
6. How much energy is given to each coulomb of charge passing through a 9 v battery?
7. 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?
8. 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?
9. Calculate the current and resistance of a 100 W ,200V electric bulb.
10.Calculate the power rating of the heater coil when used on 220V supply taking 5 Amps
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