I have an urgent electricity question which can be viewed in the attachment.
The question is: Calculate
a)the current in the main circuit
b)the p.d. across the 4 ohms resistor
c)the current through the 12 ohms resistor
For part a), What I did to find the total resistance is to find the resistance of the resistors connected in parallel first. So 1/R = 1/4 + 1/12 gives 3 ohms.
Then I would add 3 ohms with 7 ohms, which would be equal to 10 ohms - that is the total resistance of the circuit. Now I have to apply Ohm's law - I = V/RI = 20V/10R =2A
Can anyone please help me in part b and c? Thank you so much!