Question

Explain the function of a capacitor and resistor in an electronic device. You may
choose a device which has both electrical components, or separate devices for each
component.
(5 marks)
(b) Monochromatic light from a helium-neon laser of λ = 632.8 nm is incident on a
diffraction grating containing 6000 lines/cm.
(i) Analyse the number of bright fringes that can be observed.
(2 marks)
(ii) Calculate the angle for each bright fringe that occur.

Answer 1

First Question:

Explain the function of a capacitor and resistor in an electronic device.

Function of a capacitor:

(1)Capacitor is used to store energy electrostatically in an electric field.

(2)They help in blocking direct current while allowing alternating current to pass or smooth the output from a power supply.

(3)They are also used in electronic transmission systems to stabilize voltage and power flow.

Capacitor (บบ ดี 100 sf On

Function of a resistor:

(1)In electronic circuits, resistors are used to reduce current flow

(2)They also help to adjust signal levels.

(3)They help to divide voltages.

(4)They help to bias active elements.

Resistor

You may choose a device which has both electrical components, or separate devices for each
component.

Mobile phones are examples of an elecronic device which have both capacitors as well as resistors.