What do you mean by a linear resistor?

Important Questions on Electric Resistance and Ohm's Law

EASY

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 5 - Electric Resistance and Ohm's Law>QUESTIONS>Q 41

Is a light bulb an ohmic resistor, explain.

EASY

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 5 - Electric Resistance and Ohm's Law>QUESTIONS>Q 42

Nichrome and copper wires of same length and same radius are connected first in series and then in parallel and same current is passed in them in both cases. Which wire will glow first in each case?

EASY

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 5 - Electric Resistance and Ohm's Law>QUESTIONS>Q 43

Two $100 \mathrm{W}-220 \mathrm{V}$ bulbs, one having a carbon filament and the other having a metallic filament, are connected in series. Which one will glow more?

EASY

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 5 - Electric Resistance and Ohm's Law>QUESTIONS>Q 44

Water boils in an electric-kettle in $15$ minutes after being switched on. Using the same mains supply, should the length of the heating element be increased or decreased if the water is to boil in $10$ minutes? How much?

EASY

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 5 - Electric Resistance and Ohm's Law>QUESTIONS>Q 45

A heater joined ‘in series’ with a $60 \mathrm{W}$ bulb is connected to the mains. If the $60 \mathrm{W}$ bulb be replaced by a $100 \mathrm{W}$ bulb, will the heat produced by the heater be more, less or remain the same?

HARD

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 5 - Electric Resistance and Ohm's Law>QUESTIONS>Q 46

An accumulator of emf $E$ and internal resistance $r$ is first connected to an external resistance $R_1$ and then to an external resistance $R_2$ for the same time. For what value of $r$ the heat dissipated in $R_1$ and $R_2$ will be same?

MEDIUM

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 5 - Electric Resistance and Ohm's Law>QUESTIONS>Q 47

Two bulbs are marked $60 \mathrm{W} 220 \mathrm{V}$ and $100 \mathrm{W} 220 \mathrm{V}$.They are connected in parallel to the $220 \mathrm{V}$ mains. Which bulb will glow brighter? If one of the two bulbs be switched off (or removed), will the light in the room increase or decrease?

MEDIUM

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 5 - Electric Resistance and Ohm's Law>QUESTIONS>Q 47

What would happen if the two bulbs $60 \mathrm{W} 220 \mathrm{V}$ and $100 \mathrm{W} 220 \mathrm{V}$ be connected in series?