Question

what is the total current flowing the circuit heat produced by it if two resistors are connected in series z ohm metre and U ohmmeter 12watts power supply

Answer 1

144÷(U+z)^2 is equal to current

Answer 2

R = Req = z + u
p = 12 w

we know that
V = I×R = I(z+u)

also
P = V×I = I^2(z+u)
12 = I^2(z+u)

hence current = 2√[3/(z+u)] amp