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12th ICSE
IMPORTANT
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How much charge flows through a 250 V-1000 W heater in one minute?

Important Questions on Electric Resistance and Ohm's Law

HARD
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 5 - Electric Resistance and Ohm's Law>QUESTIONS>Q 23
Compute the voltage drop across a 2 kW electric heater element whose resistance when hot is 20 Ω.
HARD
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 5 - Electric Resistance and Ohm's Law>QUESTIONS>Q 24
A heating element is marked 210 V,630 W. What is the current drawn by the element when connected to 210 V DC mains? What is the resistance of the element?
EASY
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 5 - Electric Resistance and Ohm's Law>QUESTIONS>Q 25
An electric motor of 1 HP (horse-power) is running at 220 V What is the current in the motor? 
MEDIUM
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 5 - Electric Resistance and Ohm's Law>QUESTIONS>Q 26
An electric press has a resistance of 44 Ω and a current of  5.0 A flows through it. Calculate the power consumed by the press.
MEDIUM
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 5 - Electric Resistance and Ohm's Law>QUESTIONS>Q 27
A current of 4.0 A flows in a heating-wire of 100 W. Determine the resistance of the wire.
MEDIUM
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 5 - Electric Resistance and Ohm's Law>QUESTIONS>Q 28
A bulb is marked 60 W and 240 V.What will be the resistance of its filament?
MEDIUM
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 5 - Electric Resistance and Ohm's Law>QUESTIONS>Q 29
Find the ratio of the resistances of a 40 W bulb and a 100 W bulb designed to work at 220 V supply line.
HARD
12th ICSE
IMPORTANT
NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 5 - Electric Resistance and Ohm's Law>QUESTIONS>Q 30
Find the resistance of the filament of a 100 W-220 V bulb when glowing. The length and radius of the filament are 0.1 m and 2.5 × 10-5m. Find the specific resistance of the material of the filament.