4 matching electric source & load
TRANSCRIPT
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CHAPTER 8.THE BENEFITS and
DANGERS OF ELECTRICIAL ENERGY
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Electricity: An In-Demand Form of EnergyElectricity 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 lead to death.
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Why can’t a 1.5 dry cell light up a 4.5V bulb?
Matching Electric Source & LoadWhy is a 110V TV set
damage when plugged into a 220V source?
1.5V
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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 electrical appliances
properly; reducing the risks of accidents.
Matching Electric Source & Load
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Here is an example:
Voltage:Voltage:Watt Rating:Watt Rating:
Current Rating:Current Rating:
22022065650.50.5
65 WATTS 220VAC, 0.5 amperes
Matching Electric Source & Load
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Voltage:Voltage:Watt Rating:Watt Rating:
Current Rating:Current Rating:
2202200.36kWh/24h0.36kWh/24h
0.70.7
220VAC
0.7 amperes
60 Hz
0.36 kWh/24h
Matching Electric Source & Load
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Voltage:Voltage:Watt Rating:Watt Rating:
Current Rating:Current Rating:
22022060602.02.0
60 W220VAC 60Hz
2.0A
Matching Electric Source & Load
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Voltage:Voltage:Watt Rating:Watt Rating:
Current Rating:Current Rating:
220220
6A6A
220VAC / 60Hz
6A/220V220VA
220VAC / 60Hz
Matching Electric Source & Load
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Voltage:Voltage:Watt Rating:Watt Rating:
Current Rating:Current Rating:
220220580580
33
Matching Electric Source & Load
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Voltage:Voltage:Watt Rating:Watt Rating:
Current Rating:Current Rating:
220220
330A330A
Matching Electric Source & Load
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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.Connecting them to a large
amount of current will cause a damage and hamper their normal
operations.
Matching Electric Source & Load
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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 outlet.
Matching Electric Source & Load
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65 WATTS 230VAC, 1.5 amperes
Identify the voltage, wattage and current rating
of the following:
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110VAC
1.7 amperes
60 Hz
0.36 kWh/24h
Matching Electric Source & Load
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80 W115VAC 60Hz
1.0A
Matching Electric Source & Load
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220VAC / 60Hz
5A/220V220VA
110VAC / 60Hz
Matching Electric Source & Load
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Matching Electric Source & Load
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Matching Electric Source & Load
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Answers to the exercises…
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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:
23023065651.51.5
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Voltage:Voltage:Watt Rating:Watt Rating:
Current Rating:Current Rating:
1101100.36kWh/24h0.36kWh/24h
1.71.7
110VAC
1.7 amperes
60 Hz
0.36 kWh/24h
Matching Electric Source & Load
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Voltage:Voltage:Watt Rating:Watt Rating:
Current Rating:Current Rating:
11511580801.01.0
80 W115VAC 60Hz
1.0A
Matching Electric Source & Load
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Voltage:Voltage:Watt Rating:Watt Rating:
Current Rating:Current Rating:
110110
5A5A
220VAC / 60Hz
5A/220V220VA
110VAC / 60Hz
Matching Electric Source & Load
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Voltage:Voltage:Watt Rating:Watt Rating:
Current Rating:Current Rating:
220220580580
33
Matching Electric Source & Load
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Voltage:Voltage:Watt Rating:Watt Rating:
Current Rating:Current Rating:
2302303030
Matching Electric Source & Load