Question 1
An electric current in a copper wire is due to the flow of charge.
Which particles are moving along the wire?
A
-particles
B
copper nuclei
C
electrons
D
protons
Question 2
A student draws graphs of an a.c. supply and a d.c. supply.
Which row shows the correct labels for W, X and Y ?
label of W
a.c. supply
d.c. supply
time
X
Y
time
Y
X
voltage
X
Y
voltage
Y
X
Question 3
Which statement about electric current in a conductor is correct?
A
In a d.c. circuit, the electric current gradually decreases along the conductor.
B
In a d.c. circuit, the free electrons flow back and forth.
C
In an a.c. circuit, the electric current remains exactly the same all the time.
D
In an a.c. circuit, the flow of charge changes direction continually.
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