BTEC APPLIED SCIENCE UNIT 15 C AND D - DISTINCTION! RATED A+

BTEC APPLIED SCIENCE UNIT 15 C AND D - DISTINCTION




BTEC APPLIED SCIENCE UNIT 15 C AND D -
DISTINCTION

, BTEC APPLIED SCIENCE UNIT 15 C AND D - DISTINCTION




UNIT 15 AIM C PHYSICS



Section 1
DIRECT CURRENT (DC)
Direct current is a current where the charge flows in one direction, in a direct
current, the voltage and current is constant. A direct current generator is also
known as dynamo, a DC generator produces electricity when an armature coil
is placed in magnetic field where it is also connected to a split ring also called
as commutator, at the sides of the split ring there is a brush where each side of
the split ring touches the brushes changing the direction of the current in a
single direction. Battery is example of a direct current, where batteries produce
a direct current, the current flows from negative terminal to positive terminal
in the same direction, this means DC current can be stored in rechargeable
batteries. Another way of generating a direct current is by solar cell. Solar cell
converts light energy directly into electrical energy, this kind of energy is used
in houses, road sign and they are used where electrical wires cannot reach that
area.
[Patrick Mensah central Bedfordshire college 2021]


ALTERNATIVE CURRENT (AC)
With Alternative current, there is a change of direction (the current flows back
and forth) of current in the cycle or a circuit. In alternative current the voltage
is reversed due to the change of direction of the current. Alternative current is
used to deliver electric current to house, office building etc. Alternative current