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UNIT 1 UNITS ASSOSIATED WITH BASIC ELECTRICAL QUANTITIES

UNIT 1
1
...

Table 1
...
A prefix may be added to a unit to produce a multiple of the original
unit
...
A prefix usually used show in Table 1
...


Name
none
deca
hector
Kilo
Mega
Giga
Tera
deci
centi
mili
micro
nano
pico

Table 1
...
1
0
...
001
0
...
000 000 001
0
...
56µ to milliseconds
b
...
5m to millimeter
c
...
3
...
1ms = 1000µs
' µ0#
So Źźµ
#"""µ

c
...
1m = 1000mm
& ' 0#"""
So Ÿ Ź
#

1
...
1kΩ = 1000Ω
ŸŹŴŴ

So ŷ ŷΩ

% %E0#"""
#E

ŷŷŴŴΩ

Definition, units and symbols of electrical quantities
No
...


Work, W

3
...


Electromotive
Force, e
...
f

5
...


Current, I

7
...


Energy, E

MARLIANA/JKE/POLISAS-ET101/UNIT 1

Definition
Charge is defined as the quantity of electricity which flows
past a given point in an electric circuit when a current of
one ampere is maintained for one second
...

Power is defined as the rate of doing work or transferring
energy
...

$
$




The force or electrical pressure that causes a current to
flow in a circuit equivalent to the potential difference
between the terminals
...




Electrical current is a measure of the amount of electrical
charge transferred per unit time
...

ŵ

Energy is ability to do work
...

Solution 2:
Quantity of electricity, Q=It coulombs
...

Hence
Q = 10 × 240 = 2400C

Example 3
Find the conductance of a conductor of resistance:
a
...
20 kΩ

c
...


#
8

#
$'

b
...


#
8

#
#"0#"%

Ŵ ŴŸ
Ź 0 ŵŴ

'

ŹŴµ

ŵŴŴ

Example 4
A source e
...
f
...
How much energy is provided in
this time?
Solution 4:
E = Pt where P = IV = (3)(15) = 45W

t = 6 X 60s = 360s

Hence, E = Pt = (45)(360)=16
...
Rewrite the following as indicated:
a
...
0
...
10000 kHz = __________ MHz
d
...
0
...
Find the conductance of a resistor of resistance:
a
...
50 kΩ
c
...
A conductor has a conductance of 25μS
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An e
...
f
...
What is the power developed?
5
...

6
...
A current of 10A flows for 15 minutes
...
How long must a current of 100mA flow so as to transfer a charge of 80 C?
9
...
5KΩ resistor, and there is 25 volts across the resistor
...

10
...
m
...
10V supplies a current of 5A for 2 minutes

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