Between the terminals P and Q the following network of resistors is connected:
• R1 = 4 Ω and R2 = 6 Ω are connected in parallel.
• The combination of R1 and R2 is in series with R3 = 3 Ω.
• The entire arrangement obtained so far is connected in parallel with R4 = 12 Ω.
A 24 V d.c. source is applied across P and Q.
Answer the parts below, showing all working steps:
(a) Calculate the equivalent resistance between P and Q.
(b) Determine the total current drawn from the 24 V source.
(c) Find the current flowing through resistor R4.