Direct and Alternating Current
Physics ⇒ Electricity and Magnetism
Direct and Alternating Current starts at 9 and continues till grade 12.
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See sample questions for grade 10
A household appliance is rated at 220 V, 50 Hz. What does 50 Hz indicate?
A student connects a light bulb to a battery. What type of current flows through the bulb?
Describe one use of direct current in everyday life.
Explain why AC is preferred over DC for transmission of electricity over long distances.
Is the current supplied by a solar panel direct or alternating?
Name one device that converts AC to DC.
A household appliance is rated at 220 V, 50 Hz. What does 50 Hz indicate?
A student connects a light bulb to a battery. What type of current flows through the bulb?
Which of the following best describes direct current (DC)?
(1) The current flows in one direction only
(2) The current changes direction periodically
(3) The current has no direction
(4) The current flows in a circular path
Which of the following devices operates on AC?
(1) Electric iron
(2) Car battery
(3) Torch
(4) Mobile phone battery
Which of the following is a source of alternating current?
(1) Dry cell
(2) Generator
(3) Solar cell
(4) Lead-acid battery
Which of the following is a typical value for the voltage of household AC supply?
(1) 1.5 V
(2) 12 V
(3) 230 V
(4) 1000 V
Fill in the blank: The average value of AC over one complete cycle is ______.
Fill in the blank: The device used to measure electric current is called a ______.
Fill in the blank: The SI unit of electric current is ______.
In an AC circuit, the direction of current changes ______ times per second if the frequency is 50 Hz.
Alternating current (AC) reverses its direction periodically. True or False?
State whether the following statement is true or false: The current from a wall socket is alternating current.
State whether the following statement is true or false: The direction of direct current remains constant.
State whether the following statement is true or false: Transformers can only work with alternating current.
