Question

I need help writing the expression. There is no option for Req as a whole term.

the answer to Ibatt is 2.2A

2) Write an expression for the current through resistor 2.

answer to I2 is 0.68 A

Answer 1

R2 + R3 = R2 R3 / (R2 + R3) = R23 R2 and R3 in parallel

R1 + R23 = R1 R23 / (R1 + R23) R1 in parallel with R2 and R3

R = R1 R23 / (R1 + R23)

R23 = 147 * 163 / (147 + 163) = 77.3 Ω

R = 77.3 * 140 / (77.3 + 140) = 49.8 Ω

I = 212 / 49.8 = 4.26 amps thru circuit

R23 = 77.3

I23 = 212 / 77.3 = 2.74 amps thru R23

I1 = 212 / 140 = 1.51 thru R1

I1 + I23 = 1.51 + 2.74 = 4.25 current thru entire circuit

Current thru R2 current thru R23 = 2.74 amps