Question

Derive the equation for equivalent resistance when three resistances are connected in series.

Answer 1

Answer:

Let V be the potential difference across the circuit.

Let the resistors have resistances R1, R2, R3 and potential drops V1, V2 V3 across them respectively.

Let a current I flow through the circuit

According to Ohm's Law,

V = IR , So,

V1 = IR1 ; V2 = IR2 ; V3 = IR3

We know that,

Veq = V1 + V2 + V3

Veq = IR1 + IR2 + IR3

       = I (R1 + R2 + R3)

Veq/I = R1 + R2 + R3

Req = R1 + R2 + R3

Answer 2

Answer:

i suppose this is the correct explanation