Diagram \(4.1\) shows a bright spot, P, formed on the screen of a cathode-ray oscilloscope, C.R.O. when it is switched on.
- What is the meaning of cathode ray? [1 mark]
- Explain how the bright spot is formed on the screen of the C.R.O. [2marks]
- Diagram \(4.2\) shows the bright spot is displaced to \(Q\) when a direct current, d.c. supply, is connected to the Y-input of the C.R.O.
The Y-gain of the C.R.O is set at \(2 V /\) division. Calculate the input voltage of the d.c. supply. [2 marks]
- Diagram \(4.3\) shows an alternating current, a.c. supply, is connected to the C.R.O. The Y-gain of the C.R.O. remains at \(2 V /\) division.
Draw the output signal on the screen in Diagram \(4.3\) when the peak voltage of the a.c. supply is \(6 V\) and the time base is switched off. [2 marks]