Study the following electric circuit in which the resistors are arranged in three arms A, B and C : (a) Find…
Study the following electric circuit in which the resistors are arranged in three arms A, B and C :
(a) Find the equivalent resistance of arm A.
(b) Calculate the equivalent resistance of the parallel combination of the arms B and C.
(c) (i) Determine the current that flows through the ammeter.
Solution
(a) Rs = R1 + R2 + R3 = 40Ω
(b) $\dfrac{1}{Rp}$ = $\dfrac{1}{RB}$ + $\dfrac{1}{RC} \dfrac{1}{Rp}$ = 1/30Ω + 1/60Ω
Rp = 20 Ω
(c)(i) R = Rs + Rp
= 40Ω + 20Ω = 60Ω
∴ I = V/R = 6V/60Ω = 1/10 A = 0.1 A
