Energy Transfer & Transformation

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Presentation transcript:

Energy Transfer & Transformation https://www.youtube.com/watch?v=p8JQTLkV5C8

Power Power (P) – the rate of conversion of electrical energy (scalar) Units – Watts (W) The electric power in watts represents the rate at which energy is converted from electrical energy to some other form of energy, e.g., mechanical energy, heat, light, etc.

A very good example of a home appliance with a high wattage is a hair dryer. It needs only two parts to generate the hot air that dries your hair: * a heating element * a motor-driven fan Hair dryers use the heating element ( a simple wire with some resistance ) to transform electric energy into heat.

Electrical Energy Electrical Energy (W) – the energy made available by the flow of electrical charges through a conductor (scalar) Units – Joules (J)

The Cost of Electrical Energy Electricity meters measure the number of units of electricity used in a home or other building. Units (kilowatt-hours) are used instead of joules because a joule is a very small unit of energy. You wouldn’t buy potatoes by the milligram!

So what exactly is a kilowatt hour? A kilowatt hour (kWh) is a measure of how much energy you’re using. It doesn’t mean the number of kilowatts you’re using per hour. It is simply a unit of measurement that equals the amount of energy you would use if you kept a 1,000 watt appliance running for an hour: So if you switched on a 100 watt light bulb, it would take 10 hours to rack up 1 kWh of energy. Or a 2,000 watt appliance would use 1 kWh in just half an hour. While a 50 watt item could stay on for 20 hours before it used 1 kWh.

Energy Transmission