3ºESO BLOCK 2 POWER | Mediateca de EducaMadrid

Electrical energy and power. The power sources supply electrical power to the circuits. 00:00:02

The load devices consume this power and convert it to other types of energy. 00:00:09

In the international system, energy is measured in joules of J. Electrical power measures the 00:00:14

energy that is consumed by a load device or delivered by a power source over a certain 00:00:20

period. In the international system, it is measured in watts, W. 00:00:24

Power is calculated as the result of multiplying the voltage of each component by the current that flows through it. 00:00:29

The unit of energy often used is the kilowatt-hour. 00:00:37

The Joule effect. 00:00:42

In fact, all of the elements in a circuit, not just the load devices, consume a small amount of unwanted electrical energy. 00:00:49

This is a phenomenon known as the Joule effect, and it is due to the resistance of these components. 00:00:57

In our calculations in this unit, we will consider the resistance of conductors 00:01:02

and power sources to be negligible. In this exercise you have to calculate the 00:01:06

current that flows through a 1 watt motor powered by a 5 volt cell. The data is the power 00:01:13

and the voltage and you do not know the intensity. To calculate it, go through the formula that is 00:01:21

the word for power is the voltage by the intensity and clarify the equation 00:01:27

clarify the I the intensity as you have ordered that you don't have any problems 00:01:33

0.2 is the result remember not giving the results in the form of fractions in 00:01:38

this exercise we have to calculate the energy that consumes is consumed by a 00:01:48

heater with a power of 2 kilowatts that runs for 3 hours first of all the data 00:01:52

we have the power that is in kilowatts so we put it in watts that is just to 00:01:58

multiply by 1000 and the time is given to us in three hours we have to put it 00:02:04

in the units of the international system that hours remember one hour has 300 00:02:11

three thousand and six hundred seconds so you have in total three hours ten thousand and eight 00:02:22

hundred seconds and the thing with that we don't know is the energy then we have the formula that 00:02:29

says that the energy is the power by the time so as we have the units of international system to 00:02:37

because they are calculated we have to calculate it in joules that is a unit of 00:02:47

the energy in the international system we have to use watts and seconds just 00:02:51

making this operation of course you use the calculator you can solve it to 00:02:57

calculate it in in kilowatts per hour it's easier because you have industry in 00:03:04

the instructions they give you the power in kilowatts and the time in hours so 00:03:12

you just only have to multiply it and you have the result 00:03:17

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