Power dissipated by the resistor of 2 ohm (P) = i2R (where i is the current through the resistor and R is the resistance of the resistor.)Therefore: i2 = P/R =(18/2) A = 9A⇒ i= 3AResistances B and C are connected in parallel, therefore, the current is equally divided in between them i.e. 1.5A.ORThe effective resistance across the resistors of 4 ohm connected in parallel is:Req= The resistance is equal hence same current will flow through these. Hence the potential difference across the parallel combination and the 2Ω resistor is the same.

Q. 14

Three 2Ω resistor

Class 10th Xam idea - Science Model Test Paper

Answer :

Power dissipated by the resistor of 2 ohm (P) = i²R (where i is the current through the resistor and R is the resistance of the resistor.)

Therefore: i² = P/R =(18/2) A = 9A

⇒ i= 3A

Resistances B and C are connected in parallel, therefore, the current is equally divided in between them i.e. 1.5A.

The effective resistance across the resistors of 4 ohm connected in parallel is:

R_eq=

The resistance is equal hence same current will flow through these. Hence the potential difference across the parallel combination and the 2Ω resistor is the same.

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