Page 47 - CITS - Electrician - Trade Practical

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ELECTRICIAN - CITS

TABULAR COLUMN

Cells in Series
No. EMF of Cell (E) Total Voltage (V) Load Current Voltage drop Internal
of (On No Load) EMF (On Load) Resistance (I) in cells (E-V) Resistance
cells (E ) (R) of Cells (r)
T
E 1 E 2 E 3 E 4 V 1 V 2 V 3 V 4 1 2 3 4 1 2 3 4
2 -- -- 7 Ω - - - -
4 7 Ω
E − V
(r) =
Total EMF (E ) = E +E .....+E Total internal resistance (r ) = r +r ....+r 4
I
1
T
2
1
4
2
t
E − V
Internal resistance (r) = Current E
I (I) = T
R + r
E
Cells in Parallel (I) = T E
R + r I = T
R
No. EMF of Cell (E) Tot al Terminal Load Current in + 1 r Voltage Total
E −

of (On No Load) E EMF Voltage (V) Resistance Current cells (r) = Drop V internal
cells I = T 1 (E ) (On Load) (R) (I) (E-V) Resistance
I
E
E E E R + r T I I I I (r)
1 2 3 4 1 2 3 4
-
2 -- -- 7 Ω - (I) = E T R + r
4 7 Ω
Total EMF (E ) = EMF of individual cell Total Current E
T
Total internal resistance (1/r) = 1/r +1/r ....+1/r I = T
1 2 4 R + 1
r

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CITS : Power - Electrician & Wireman - Exercise 16