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Question 21M.2.HL.TZ1.a

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Date May 2021 Marks available [Maximum mark: 2] Reference code 21M.2.HL.TZ1.a
Level HL Paper 2 Time zone TZ1
Command term Explain Question number a Adapted from N/A
a.
[Maximum mark: 2]
21M.2.HL.TZ1.a

A device sends an impulse of electrical energy to maintain a regular heartbeat in a person. The device is powered by an alternating current (ac) supply connected to a step-up transformer that charges a capacitor of capacitance 30 μF.

 

Explain the role of the diode in the circuit when the switch is at position A.

[2]

Markscheme

to charge a capacitor current must be direct ✓

diode will only allow current to flow in one direction

OR

the diode provides half wave rectification ✓

 

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