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Calculate the increase in kinetic energy for the electron accelerated between the two plates shown above.
( q_e = -1.6 x 10^-19 C )(2)

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(a) What does the term emf mean?(1)
(b) What causes the lost volts in a cell?(1)

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For the circuit shown above calculate the
(a) lost volts(3)
(b) internal resistance(2)
(c) short-circuit current.(2)

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(a) Calculate R_x for when the bridge is balanced. (2)
(b) When R_x is adjusted slightly from its balanced position by ΔR sketch the graph of the out of balance voltage against ΔR. (1)

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(a) Calculate the frequency of the wave displayed. (3)
(b) State the peak voltage. (1)
(c) Calculate the RMS voltage. (2)

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(a) While the capacitor is charging, a voltage of 4 V is measured across the resistor.
Calculate the voltage across the capacitor at that time. (1)
(b) What is the voltage across the capacitor when it is fully charged? (1)
(c) What does a capacitance of 400 μF mean? (1)

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(a) Calculate the gain of the amplifier. (2)
(b) Calculate the value of R_f. (2)

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(a) What mode is this op-amp operating in? (1)
(b) Calculate the output voltage. (2)
(c) The 200 kΩ resistors are now replaced by 400 kΩ resistors. What is the new value for V_o? Explain your answer! (2)

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Sketch graphs for current against frequency for both circuits. (2)

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(a) A capacitor holds a charge of 8 mC at 0.5 V.
Calculate its capacitance. (2)
(b) Another capacitor of value 12 μF is charged to 40 V.
Calculate the energy stored in the capacitor. (2)

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Q"+Q+".

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