Question

two resistors are connected in series across a 24V supply and a current of 3A flies in the circuit.If one of the resistors has a resistance of 2 determine a. the value of the other resistors,and b. the potential difference across the 2 resistors.If the circuit is connected for 50 hours,how much energy is used?

Answer 1

Hey dear your answer is here

Hope it helps:)

Answer 2

Answer:

a) 6 ohm

b) 6V

c) 12960000J  

Solution:

let, r1 and r2 be the two resistors

V be the voltage supply across r1 and r2

I be the current on the circuit

here, r1 = 2 ohm

V = 24V and I = 3A

since, the resistance are in series

so, total resistance = r1 +r2 = 2+ r2

we know,

V = I( total resistance)

24 = 3 (2 +r2)

24 = 6 + 3r2

3r2 = 24-6

3r2 = 18

r2 = 6 ohm

now, the potential difference across the 2 resistors will be

V1  = I r1

V1 = 3*2 = 6 V

power = VI = 24*3 = 72 watt

again, energy = power* time

energy = 72*180000 = 12960000J , since 50hr = 180000sec