Why we specifically note resistance in a circuit while all part of a wire have some resistance..???
The resistance of the rest of the circuit compared to the resistance of the resistor is negligible.
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Does transformer have any resistance,other than ohmic resistance? (Ajay Asked) Waiting for response from students and visitors
You are given two nichrome wire of same length and different thickness Which wire will get heated first Give reason.? Asked Merlin Mary Mathew Answer: If the wires are connected one by one to a source, (or connected in parallel to the same source) the one having less resistance (Greater thickness) will get heated up first. […]
An Electric Heater of resistance 8 ohm draws 15 A from service mains 2 hrs. Calculate rate at which heat is developed in heater. Please tell me the answer in watt and joule
“There is a wire whose resistance is R. it is streched, and its length gets increased to 2%. find new resistance.” – Knishka Agrawal asked Answer: The resistivity does not change due to stretching, but the length and area of cross section changes; but the volume remains constant. Therefore, resistance changes which can be calculated …Read the full post
When stretched, the volume remains constant. So, A1l1=A2l2 Original resistance R1= rl1/A1 Final Resistance R2= rl2/A2 Percentage change in resistance = (R2-R1)x100/(R1) Substitute the values and try to get the answer
Pratham asked: The resistances of 2 bulbs are in the ratio 1:2.if they are joined in series,find the ratio of the energy consumed by the 2 bulbs? Answer: When connected in series, the same current flows through each of the resistors. Therefore, the energy dissipated is directly proportional to their resistances. That is, the…… Continue reading A Question from Current Electricity