Physics 5054 · O Level · Electric circuits

Electric circuits — practice question

The glass tube makes up the main body of a cathode-ray oscilloscope. Electrons are released from a hot metal filament at one end of the tube.

(a)[2]

State two conditions that allow electrons to keep flowing continuously in the tube.

(b(i))[1]

Energy is delivered to the LED by the NAND gate. State the source of this energy.

(b(ii))[2]

Complete the NAND-gate truth table.

Worked solution & mark scheme

This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “A sufficiently high positive potential” …