Question:

Two electric bulbs, one of $200\, V$, $40\, W$ and other of $200\,V$, $100 \,W$ are connected in a domestic circuit. Then

Updated On: Jul 7, 2022
  • resistance of 40 W bulb is more than 100 W bulb
  • they have equal resistance
  • the resistante of 100 W bulb is more than 40 W bulb
  • they have equal current through them.
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The Correct Option is A

Solution and Explanation

Using $P = \frac{V^2}{R} $ we get R = $\frac{V^2}{P}$ In domestic circuit, same voltage is applied across each bulb $\therefore \, R \propto \frac{1}{P}$ or $R_{40} \propto \frac{1}{40} $ and $R_{100} \propto \frac{1}{100}$ Clearly, resistance of 40 W bulb is more than 100 W bulb
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Notes on Resistance

Concepts Used:

Resistance

Resistance is the measure of opposition applied by any object to the flow of electric current. A resistor is an electronic constituent that is used in the circuit with the purpose of offering that specific amount of resistance.

R=V/I

In this case,

v = Voltage across its ends

I = Current flowing through it

All materials resist current flow to some degree. They fall into one of two broad categories:

  • Conductors: Materials that offer very little resistance where electrons can move easily. Examples: silver, copper, gold and aluminum.
  • Insulators: Materials that present high resistance and restrict the flow of electrons. Examples: Rubber, paper, glass, wood and plastic.

Resistance measurements are normally taken to indicate the condition of a component or a circuit.

  • The higher the resistance, the lower the current flow. If abnormally high, one possible cause (among many) could be damaged conductors due to burning or corrosion. All conductors give off some degree of heat, so overheating is an issue often associated with resistance.
  • The lower the resistance, the higher the current flow. Possible causes: insulators damaged by moisture or overheating.