electrical safety matching load and source electrical source and load benefits and dangers of electricity dangers of electricity benefits of electricity

1. CHAPTER 8.
THE BENEFITS and
DANGERS OF

2. Electricity: An In-Demand Form of Energy
Electricity provides us many
valuable things that without it
we would live a hard and
difficult life day by day.
Despite its many benefits,
electricity could bring danger
as well from the most
common house fires to
electrocution, which may

3. Why can’t a 1.5 dry cell light up
Matching Electric Source & Load
Why is a 110V TV set damage
when plugged into a 220V
source?
1.5V

4. All electrical energy appliances
are designed to work efficiently
at a certain voltage. This is its
voltage rating. It is usually
written at the back of an
appliance.
Knowing what these label
mean helps a person use the
Matching Electric Source & Load

5. Here is an example:
Voltage:Voltage:
Watt Rating:Watt Rating:
Current Rating:Current Rating:
220220
6565
0.50.5
65 WATTS
220VAC, 0.5 amperes
Matching Electric Source & Load

6. Voltage:Voltage:
Watt Rating:Watt Rating:
Current Rating:Current Rating:
220220
0.36kWh/24h0.36kWh/24h
0.70.7
220VAC
0.7 amperes
60 Hz
0.36 kWh/24h
Matching Electric Source & Load

7. Voltage:Voltage:
Watt Rating:Watt Rating:
Current Rating:Current Rating:
220220
6060
2.02.0
60 W
220VAC 60Hz
2.0A
Matching Electric Source & Load

8. Voltage:Voltage:
Watt Rating:Watt Rating:
Current Rating:Current Rating:
220220
6A6A
220VAC / 60Hz
6A/220V
220VA
220VAC / 60Hz
Matching Electric Source & Load

9. Voltage:Voltage:
Watt Rating:Watt Rating:
Current Rating:Current Rating:
220220
580580
33
Matching Electric Source & Load

10. Voltage:Voltage:
Watt Rating:Watt Rating:
Current Rating:Current Rating:
220220
330A330A
Matching Electric Source & Load

11. The following labels indicate
that the appliances operates
normally and efficiently on the
specified values.
If connected to a lower voltage
source, it will not work
efficiently. The electric current
through these appliances will
not be enough.
Matching Electric Source & Load

12. Some appliances, like
flashlights, portable radios, and
calculators are designed to
operate on direct current (DC).
Batteries supply direct current
to such appliances.
Unless an AC-DC converter is
used, these appliances should
not be connected to a wall
Matching Electric Source & Load

13. 65 WATTS
230VAC, 1.5 amperes
Identify the voltage, wattage
and current rating of the
following:

14. 110VAC
1.7 amperes
60 Hz
0.36 kWh/24h
Matching Electric Source & Load

15. 80 W
115VAC 60Hz
1.0A
Matching Electric Source & Load

16. 220VAC / 60Hz
5A/220V
220VA
110VAC / 60Hz
Matching Electric Source & Load

17. Matching Electric Source & Load

18. Matching Electric Source & Load

19. Answers to the exercises…

20. 65 WATTS
230VAC, 1.5 amperes
Identify the voltage, wattage
and current rating of the
following:
Voltage:Voltage:
Watt Rating:Watt Rating:
Current Rating:Current Rating:
230230
6565
1.51.5

21. Voltage:Voltage:
Watt Rating:Watt Rating:
Current Rating:Current Rating:
110110
0.36kWh/24h0.36kWh/24h
1.71.7
110VAC
1.7 amperes
60 Hz
0.36 kWh/24h
Matching Electric Source & Load

22. Voltage:Voltage:
Watt Rating:Watt Rating:
Current Rating:Current Rating:
115115
8080
1.01.0
80 W
115VAC 60Hz
1.0A
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23. Voltage:Voltage:
Watt Rating:Watt Rating:
Current Rating:Current Rating:
110110
5A5A
220VAC / 60Hz
5A/220V
220VA
110VAC / 60Hz
Matching Electric Source & Load

24. Voltage:Voltage:
Watt Rating:Watt Rating:
Current Rating:Current Rating:
220220
580580
33
Matching Electric Source & Load

25. Voltage:Voltage:
Watt Rating:Watt Rating:
Current Rating:Current Rating:
230230
3030
Matching Electric Source & Load