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h2>13.1 Circuit rules AQA AS Physics C13 DC Circuits Kerboodle Answers : Page No. 216
1.Ans-
a the current through each light bulb.
1.0 A, 4.0A
b the current from the battery,
5.0A
c the power supplied by the battery.
30W
2.Ans-
a Sketch the circuit diagram for this circuit.
b
i the pd across the variable resistor,
2.0V
ii the current through the torch bulb.
0.20A
3.Ans-
a Sketch the circuit diagram.
b The ammeter reads 0.20 A, Calculate
i the pd across the 20 Q resistor,
4.0V
ii the pd acrossR,
2.0 v
iii the resistance of R.
10 Ω
4.Ans-
a the pd across the torch bulb,
3.6V
b the resistance of the torch bulb.
30 Ω
13.2 More about resistance AQA AS Physics C13 DC Circuits Kerboodle Answers : Page No. 219
1.
a 16 Ω
b 3.0 Ω
c 4 Ω
2.
.
a the combined resistance of the 3 resistor and a 6 Q resistor in parallel
2 Ω
b the total resistance Of the circuit
6 Ω
c the battery current
1.0 Ω
d the power supplied to the 4 Q resistor.
4.
0 Ω
3.
a the total resistance of the circuit
3.6 Ω
b the battery current
0.83 A
c the power supplied to each resistor
2 Ω: 0.5 W, 4 Ω: 1.0W, 9 Ω: 1.0 W
d the power supplied bg the battery,
2.5 W
4.
a
14.4 W
b 2.4 Ω
13.3 Electromotive force and internal resistance AQA AS Physics C13 DC Circuits Kerboodle Answers : Page No. 222
1.
a the total resistance Of the circuit
6.0 Ω
b the current through the battery
2.0A
c the lost pd
3.0V
d the pd across the cell terminals.
9.0V
2.
a the current
0.5A
b the terminal pd
1.25 v
c the power delivered to the 2.5 Q resistor
0.63W
d the power wasted in the cell.
0.13W
3.a the internal resistance of the cell
2.0 Ω
b the cell’s em f.
1.5V
4.12V, 2 Ω
13.4 More circuit calculations AQA AS Physics C13 DC Circuits Kerboodle Answers : Page No. 225
1.
a the total resistance of the circuit
12.0 Ω
b the cell current
0.25A
c the current and pd for each resistor.
4 Ω: 0.25A, 1.0V, 24 Ω: 0.08A, 2.0V; 12 Ω: 0.17 A, 2.0 V
2 .a the total resistance of the circuit
20.0 Ω
b the cell Current
1.05A
c the current and pd across the 15 Q resistor.
1.05A, 15.8V
3.i the power delivered to each external resistor,
2.0W
ii the power wasted due to internal resistance.
2.0W
13.5 The potential divider
AQA AS Physics C13 DC Circuits Kerboodle Answers : Page No. 227
1.The brightness of the light bulb increases gradually from zero to maximum brightness.
2.i the current,
0.5A
ii the pd across each resistor.
8.0 Ω n: 4.0V; 4. Ω: 2.0V
b.i 20 C,
3.0V
ii 10C C.
4.0V
3.
2.8V
ii 6.4k Ω
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Practice questions: Page No. 228-229
1.(a) Draw the arrangement, using all three resistors, which will give the largest resistance
(b) R = 3.0 + 4.0 + 6.0 = 13 Ω
(c) Draw the arrangement using all three resist off, which will give the smallest resistance.
(d)
2.
(a).
(b)
3. (a)
(b)
c (i)
(ii) total power P = I2 R = 2.42 × 11 = 63 W
4.
(a)
b (i)
(ii)
(iii) Calculate the resistance of R.
(iv) Calculate the emf of the battery. (6 marks) AQA. 2007
5.
(i) the total Current in the circuit,
(ii) the voltage between the points P and O,
pd across PQ
= pd across total external resistance
= I R = 0.194 × 60
= 11.6 V
(iii) the power dissipated in resistor A.
Power P = I2 R = 0.1942 × 30
= 1.13 W
(iv) Energy dissipated = Pt = 1.13 × 20
= 23 J
6.
(a) (i) zero (0 V), or negligibly small
(ii)
(iii)
(b) So that the current supplied by the unit is restricted to a value below danger level.
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