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4.3 Electric circuits

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Question 77

In a cathode-ray tube, thermionic emission at the cathode produces electrons, which are then accelerated toward the anode in a vacuum. To operate the tube, two different potential differences are required: one to heat the filament (to emit electrons) and another to accelerate the electrons.

Which combination represents suitable values for these two potential differences?

A

Filament heating voltage: 6 V6\text{ V}6 V d.c.; Cathode-to-anode voltage: 6 V6\text{ V}6 V a.c.

B

Filament heating voltage: 6 V6\text{ V}6 V a.c.; Cathode-to-anode voltage: 2000 V2000\text{ V}2000 V d.c.

C

Filament heating voltage: 2000 V2000\text{ V}2000 V d.c.; Cathode-to-anode voltage: 6 V6\text{ V}6 V d.c.

D

Filament heating voltage: 2000 V2000\text{ V}2000 V a.c.; Cathode-to-anode voltage: 2000 V2000\text{ V}2000 V a.c.

Markscheme

4.3 Electric circuits Questions

  1. IGCSE
  2. /Physics
  3. /4.3 Electric circuits

136 exam-style questions on CIE IGCSE Physics 4.3 Electric circuits, covering 4.3.1a Circuit diagrams and circuit components, 4.3.2a Series circuits, 4.3.2b Parallel circuits, 4.3.2c Current and potential difference in circuits, 4.3.2d Combined resistance of resistors in parallel, and 4.3.3 Action and use of circuit components. Each one has a worked solution and a mark scheme showing where the marks go.

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