K.C.S.E Physics Q & A - MODEL 2017PP2QN18
​(a) State two factors that affect the capacitance of a parallel plate capacitor.
(b) Figure 9 shows an electric circuit in which three capacitors are connected across a power supply. 
​Determine the;
(i) total capacitance, (ii) quantity of charge stored on the 8uF capacitor.
answers
​(a) — Area of overlap of the plates
— Distance between the plates. — Type of dielectric. 
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K.C.S.E Physics Q & A - MODEL 2017PP2QN14
State how heating is achieved in a resistance wire.
answer
K.C.S.E Physics Q & A - MODEL 2017PP2QN13
​Figure 4 shows three resistors connected in series.
​Using Ohm’s law, show that the effective resistance is given by the expression:
RT=RI+R2+R3
answer
K.C.S.E Physics Q & A - MODEL 2016PP2QN16
​Figure 8, shows a circuit that may be used to charge a capacitor.
(i) state the observation on the milliameter when the circuit is switched on:
(ii) explain the observation in (i) above. b)The circuit in figure 8 is left on for some time. State the value of p.d. across: (i) the resistor R; (ii) the capacitor C; (c) sketch the graph of potential difference (V) across R against time. ​(d) Figure 9 shows three capacitors connected to a 10V battery 
​Calculate:
(i) the combined capacitance of the three capacitors; (ii) the charge on the 5.0 uF capacitor.
answers
​(a)(i)Current falls off to zero.Falling to zero deflects to maximum then zero.
(ii)Current flows when the capacitor is charging. When fully charged no current flows and potential difference (p.d.) is equal to charging voltage (b) (i)VR = 0 volts (ii)Vc = 5 Volts 
K.C.S.E Physics Q & A - MODEL 2015PP2QN17
​(a) State three factors that affect the capacitance of a parallel plate capacitor.
(b) Figure 5 shows the circuit used to charge a capacitor C 
​(i) State what would be observed on the following when the switch is closed:
(I) the milliammeter; (II) the voltmeter; (ii) Explain how the capacitor gets charged. (iii) State the purpose of the resistor R. (iv) On the axes provided, sketch the graph of voltage (V) against time (t) 
answers
​(a) distance of separation between plates
area of overlap of plates type of dielectric between plates (b) (i) (I) Current rises to maximum and then drops to zero (II) Potential difference between the plates increases to a maximum (ii) Negative charges flow from the negative terminal of the battery to one plate of the capacitor. Negative charges flow from the other plate of the capacitor to the positive terminal of the cell hence equal positive and negative charges gather on the plates, opposing further flow of electrons when fullycharged (iii) Resistor - to slow down the charging process so that current and voltage are is observed. 
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M.A NyamotiMy passion is to see students pass using right methods and locally available resources. My emphasis is STEM courses |
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