1
Q
Ohm’s Law
A
V = I x R
Voltage(V) = Current(A) x Resistance(Ohms)
2
Q
Electrical Power
A
P = V x I
Power(W) = Voltage(v) x Current(A)
3
Q
Energy
A
E = P x t
Energy(J) = Power(W) x Time(sec)
4
Q
Work formula
A
W = F x d
Work(J) = Force(N) x Distance(m)
5
Q
Force formula
A
F = M x a
Force = Mass(Kg) x Acceleration(ms-2)
6
Q
Losses of a System formula
A
Losses = P(in) - P(out)
7
Q
Efficiency of a system
A
n = (P(Out)/P(in)) x 100
8
Q
Comparing resistances of conductors in terms of Length
A
R2 = (R1 x L2) / L1
Resistor 2(Ohms) = ( Resistor 1(Ohms) x Length 2(m) ) / Length 1(m)
9
Q
Comparing resistances of conductors in terms of Cross Sectional Area
A
R2 = (R1 x A1) / A2
DC Theory
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