# Heating Effect of Electric Current

## Trending Questions

**Q.**A resistance coil is made by combining two 2.5 ohm resistances in series. A 1.0 V steady voltage is applied across the two ends of the coil for 5 minutes. The heat generated is:

**Q.**

**Question 1**

Illustarte the following effects of electric current:

(a) Heating effect

(b) Chemical effect

(c) Magnetic effect

**Q.**How do u calculate the total electrical energy?

**Q.**

If four resistances each of values 1 ohm are connected in series, resultant resistance will be in:

1

0

4

3

**Q.**You are given three bulbs 25W, 40W and 60W. Which of them has the lowest resistance?

- 25 watt bulb
- 40 watt bulb
- Insufficient data
- 60 watt bulb

**Q.**

Write one expression for the electrical energy in terms of its potential difference, resistance and time.

**Q.**If the direct transmission method with a cable of resistance 0.4 Ω km−1 is used, the power dissipation (in %) during transmission is

- 50
- 30
- 20
- 40

**Q.**

How does the heat produced in a wire or a conductor depend upon the resistance of the conductor?

**Q.**

How does the amount of heat produced in a resistor depend upon current?

**Q.**An electric heater of resistance 200Ω . At what rate will heat be produced in it, when current of 2.5A flow through it.

**Q.**A fuse is rated 8A. Can it be used with an electrical appliance rated 5KW, 200V? Give a reason.

**Q.**ntTwo electric bulbs rated 50 W and 100 V are glowing at full power, when used in parallel with a battery of emf 120 V and internal resistance 10 ohm.The maximum no. of bulbs that can be connected in the circuit when glowing at full powern nta)6n ntb)4n ntc)2n ntd)8n

**Q.**A 25 watt, 220 volt bulb and a 100 watt , 220 volt bulbs are connected in series across 440 volt line

- only 100 watt bulbs will fuse
- only 25 watt bulbs will fuse
- none of these bulbs will fuse
- both bulbs will fuse

**Q.**If two wires 1 mm and 2 mm thick are made of same mass of copper connected in series and current is passed through them, then heat produced in the wires is in the ratio.

- 2:1
- 4:1
- 16:1
- 8:1

**Q.**

Choose the substance that is used to make the filament of an electric bulb?

Tungsten

Copper

Aluminium

Mercury

**Q.**An electric kettle of power 1 kw runs at 220 v potential. The current flowing

in the kettle is,

a) 4.55 amp

b) 45.5 amp

c) 455 amp

d) 0.455 amp

**Q.**A potential clifference of 220V is applied across a resistance of 440Ω in an electrical appliance. Calculate the current drawn and the heat energy produced in 20 seconds.

- 2400J
- 2300J
- 2500J
- 2200J

**Q.**An electric bulb is rated 220V and 100W. When it is operated on 110V, the power consumed will be :

- 100W
- 75W
- 50W
- 25W

**Q.**Why electric current is scalar?

**Q.**Two resistor R and 2R are connected in parallel in an electric circuit. The thermal energy developed in R and 2R are in the ratio of

- 1:4
- 4:1
- 1:2
- 2:1

**Q.**Why electric flux =E. ds?Is there any Mathematical derivation for this to know why electric flux! =E. is?

**Q.**

Three lamps $100\mathrm{W},60\mathrm{W}$ and $40\mathrm{W}$ respectively are connected in parallel to a power supply of $220\mathrm{V}$. Calculate (a) total energy consumed (b) total resistance of arrangement (c) cost of keeping them lighted for 6 hours daily for 30 days, if cost of electricity per unit is ₹ 2.80.

**Q.**An electric motor driven pump fills an overhead tank placed at a height of 20 m from the ground-level sump at a rate of 20, 000 litre water per hour.The motor has an operating resistance of 22Ω and is connected across a 220 V source.The efficiency of this motor is (Useg=9.8m/s2)

- 73.5%
- 22.5%
- 49.5%
- 12.5%

**Q.**A lightbulb uses energy at a rate of 25.0Watts.

If the current through the lightbulb is 2.00A. What is the resistance of the bulb?

- 6.25 ohm
- 12.5 ohm
- 0.0800 ohm
- 100.0 ohm
- 50.0 ohm

**Q.**Four bulbs having powers 25 W, 40 W, 60 W and 100 W are connected in series and this combination is connected across the mains. Find which bulb has highest potential difference and lowest potential difference ?

**Q.**Two identical heater wires are first connected in series and then in parallel with a source of electricity. The ratio of heat produced in the two cases ?

- 2:1
- 1:2
- 4:1
- 1:4

**Q.**A bulbs is connected to a battery of p.d. 4 V and internal resistance 2.5Ω. A stedy current of 0.5 A

(i) the total energy supplied by the battery in 10 minutes,

(ii) the resistance of the bulb, and

(iii) the energy displated in the bulb in 10 minutes

**Q.**When the current and voltage of an electric circuit is given. Then power can be calculated by:

- multiplying the current by the difference between the voltage going into and going out of the device
- multiplying the resistance by the resistance and the current
- multiplying the voltage by the difference between the current going into and going out of the device
- multiplying the current by the resistance
- multiplying the current by the voltage

**Q.**Figure shows three resistor configurations R1, R2 and R3 connected to 3 V battery. If the power dissipated by the configuration R1, R2 and R3 is P1, P2 and P3, respectively, then

- P1>P2>P3
- P1>P3>P2
- P2>P1>P3
- P3>P2>P1

**Q.**In the circuit shown, the heat produced in 5Ω resistor is 10 calorie/sec. The heat produced/sec in 4Ω resistor will be :

- 1 cal
- 2 cal
- 3 cal
- 4 cal