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.
(i) total capacitance,
(ii) quantity of charge stored on the 8uF capacitor.
K.C.S.E Physics Q & A - MODEL 2017PP2QN14
State how heating is achieved in a resistance wire.
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:
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
(i) the combined capacitance of the three capacitors;
(ii) the charge on the 5.0 uF capacitor.
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)
(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.
FORM I - PHYSICS SYLLABUS
FORM II - PHYSICS SYLLABUS
FORM III - PHYSICS SYLLABUS
FORM IV - PHYSICS SYLLABUS
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