Question

1)________ is used to change resistance in a circuit.
2)_________ is used in filament of electric bulb.

Answer 1

Answer:

1. Rheostat is used to change net resistance in a circuit

2. Tungsten is used in filament of electric bulbs.

Additional information about the statements :

1st Statement:

• Rheostat is also known as variable resistance.
• It mainly consists of a coil ,whose length can be changed as per resistance requirement.
• Rheostats can't be used on very high voltages as they may catch fire and burn.

2nd statement:

• Tungsten is represented by W in the Periodic Table.
• It's German name is "Wolfram", that's why represented with W.
• It has very high resistance , hence generates lot amount of heat
• It also has a high melting point.
• In an oxygen free environment, it also generates light without getting burnt , hence used in filament bulb.

Answer 2

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1) Rheostat is used to change resistance in a circuit.

2)Tungsten is used in filament of electric bulb.

Additional Information :