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An electric circuit is set up in such a way that the positive terminal of a battery V is connected to a bulb B1 which is connected to a resistor R which is connected to bulb B2. B2 is finally connected to the negative terminal of the battery. Both the bulbs are glowing. If the value of R is increased, then

An electric circuit is set up in such a way that the positive terminal of a battery V is connected to a bulb B1 which is connected to a resistor R which is connected to bulb B2. B2 is finally connected to the negative terminal of the battery. Both the bulbs are glowing. If the value of R is increased, then Correct Answer both B<sub>1</sub> and B<sub>2</sub> will become dimmer

Concept:

Electric Current and voltage:

  • The rate of flow of charge is called electric current. 
  • For electric current to flow, there should be a potential difference between the two points. 
  • Potential difference is work done in moving a unit positive charge from one point to another. 

Electric Circuit:

  • The electric circuit is the path of the current. 
  • It contains a battery, connecting wires, and electrical devices like a bulb, fan etc. 

Ohms Law:

The potential difference (V) is the product of current and resistance at a particular temperature.

V = IR

V is voltage, I is current, R is resistance.

Resistance is the ability to resist the flow of current. 

Explanation:

Given,

[ alt="F1 Prakash Jha Anil 15-06.21 D2" src="//storage.googleapis.com/tb-img/production/21/06/F1_Prakash%20Jha_Anil_15-06.21_D2.png" style="width: 272px; height: 178px;">

  • The positive terminal of a battery V is connected to a bulb B1.
  • It is connected to resistor R and another Bulb B2.
  • Now, by Ohms Law, when the resistance will increases, the current will decrease.
  • Bulbs are also having resistance. 
  • So, the net resistance will be increasing if the R will increase. 
  • If R is increased, the current will decrease and hence less current will be drawn. 
  • So, if the current is less, both bulbs will be dimmer. 
  • Power in the bulb is given as P = I2 R. 
  • So, if I decrease, P will also decrease.

Correct option is 'both B1 and B2 will become dimmer.'

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