2. In electric circuit, the energy carriers
are free electrons.
COULOMB – basic unit of electric
charge
***To produce 1 coulomb of electric
charge, 6.3 x 10 by 18 electrons
are required.

7. 1 a = 1C/ sec
= 0.3 A/sec x sec / 6.3 x 10^18 C
= 0.048 A
C= It
= (0.048 C/sec) (1 sec)
= 0.048 C

9. AC
( alternating current)
DC
(Direct current)

11. A battery
produces
direct current
in a circuit
because the
terminals have
the same
opposite
charges.

12. A kind of current
in household
circuits wherein
there is a
continuous back
and forth
movement of
electrons in the
circuit.

13. Direct
Current
DC
 Provided by
batteries
Alternating
Current
AC
 Provided by power
companies