Heating Effect of Current

Q.

Name two safety measures commonly used in electric circuits and appliances.

Q.

Why are alloys commonly used in electrical heating devices?

Q.

An electric heater is rated 1000 W - 200 V. Calculate

The resistance of the heating element.

Q. An electric bulb glows due to the _________ of electric current.

1. chemical effect
2. magnetic effect
3. heating effect
4. physical effect

Q.

The potential difference between the live wire and the neutral wire in India is

1. 110V

2. 50V

3. 220V

4. none of these.

Q.

Which material is used for making the filament of an electric bulb and why?

Q.

In an electric circuit, explain why a fuse is always connected in series.

Q.

Which of the following effects of electric current is made use of in the figure shown below?

1. All of the above

2. Heating

3. Magnetic

4. Chemical

Q.

When the current in a conductor is doubled, keeping other parameters constant, the heat generated in it will become ___ times.

Q.

Is a fuse connected in series or parallels in the household circuit?

Q. Which of the following property is not associated with an electric wire?

1. Ductility
2. Inexpensive
3. Mallaebility
4. Conductivity

Q.

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

Resistance of the conductor?

Q.

Find the resistance of an electric motor which when connected across a battery of 6 volts for 1 min runs with 216 Joules of energy

1. 5Ω

2. 36Ω

3. 10Ω

4. 6Ω

Q.

How does the heat produced in a wire or a conductor depend upon the:

Current passing through the conductor?

Q.

Which of the following electrical appliances does not have a heating element?

1. Electric cooker

2. Electric toaster

3. Electric Fan

4. Soldering iron

Q. Conceptual Questions
If you were to design an electric heater using Nichrome wire as the heating element, what parameters of the wire could you vary to meet a specific power output such as $1000W$?

Q. Why does the cord of an electric heater not glow while the heating element does ?