Specific objectives.
Electric current.
Electric current.
Q = It
1 Q = 6.25 x 1018
Electric circuit.
Cell.
Types of cell.
Flow of electric current.
Potential difference.
p.d = E/Q =E/It but E/t = power
p.d =power/amperes =w/a
V = Power = VI
Electromagnetic force (e.m.f).
Internal resistance.
Resistors.
Factors affecting resistance.
Resistivity.
R
R = Pl/A
P =RA/L = where P is a constant SI unit = ɲm
Current- voltage relationship.
Ohm’s law.
V =IR R is set to represent the resistance of the conductor.
Resistors arrangement.
Series arrangement.
Total voltage (p.d) = VT = V1 + V2 + V3 but
VT = ITRT
ITRT = IR1 + IR2 + IR3
IR = I (R1 + R2 + R3)
RT = R1 + R2 + R3
Parallel arrangement.
IT = I1 + I2 + I3
Types of resistors.
Measurement of resistance.
Voltmeter- ammeter method.
Requirement.
Limitation of the experiment.
Meter- bridge method.
How it works.
R L
= or =
N =
Precautions.
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