In the diagram above, determine the r.m.s current
Attached Figure / Diagram
A
31A
B
48A
C
60A
D
80A
Verified Correct Answer: B.
Physical Principles & Numerical Solution
Ir.m.s = Vr.m.s/Z
But Z =
\sqrt R2 + XL2
=
\sqrt 42 + 32
=
\sqrt 16 + 9
=
\sqrt 25
∴Ir.m.s = 240/5
= 48.0A
Source: Myschool Past Questions Archive (Record #11875)