MCQs: Component combinations

Component combinations

1. 1.
2.
3.
4.

No current flows so pd across r = 0V
Pd from P to S = 12V

2. 1.
2.
3.
4.

Total resistance = V/I = 12/0.5 = 24Ω
Internal resiatnce = 4Ω

3. 1.
2.
3.
4.

Total EMF = 6-6+6 = 6V
I=V/R = 6/6= 1 A

4. 1.
2.
3.
4.

Total EMF = 12+12 +6 = 30V
I=V/R = 30/12 = 2.5 A

5. 1.
2.
3.
4.

The one in the middle draws no current so can be ignored.
Two 12Ω in series = 24Ω
two 24Ω in parallel = 12Ω

6. 1.
2.
3.
4.

R = 12 + 6

7. 1.
2.
3.
4.

Two 12's in parallel = 6Ω
Total = 6 + 12 = 18Ω

8. 1.
2.
3.
4.

Total of each combination of 12 and 6 = 4Ω as in qu.1

Two 4Ω in parallel gives 2Ω

9. 1.
2.
3.
4.

1/R = 1/12 + 1/12 + 1/6 = (1 + 1 + 2)/12 = 4/12
R = 12/4

10. 1.
2.
3.
4.

1/R = 1/R1 + 1/R2 = 1/6 + 1/12 = (2+1)/12 = 3/12
R = 12/3

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