Electric Power Grade 8 Science by Jocelyn Sanglap

本站添加: 2026-05-19

[00:00:01][music] >> Good day, everyone. Today, I am going to discuss an important topic in physics, [music] electric power.

[00:00:15]Electric power is [music] part of our everyday life because almost everything we use today depends on electricity.

[00:00:22]Our lights, electric fans, refrigerators, televisions, chargers, [music] and even computers all need electric power to work.

[00:00:34]Because of this, understanding electric power [music] helps us understand how electrical devices function and how electricity is used safely and efficiently.

[00:00:45]>> [music] >> Now, let us understand what is electric power.

[00:00:50]Electric power is the rate at which electrical energy is used or transferred in a circuit.

[00:00:57]In simple terms, it tells us how fast electricity is being used by a device or appliances.

[00:01:07]For example, a brighter [music] light bulb usually uses more electric power than a dim bulb. Appliances [music] that produce more heat, light, or motion generally consume more electrical power.

[00:01:20]For instance, [music] an electric fan uses less power compared to an air conditioner. A phone charger [music] uses less power compared to a refrigerator.

[00:01:30]This shows that different appliances [music] consume different amount of electric power depending on their [music] function.

[00:01:38]Before we fully understand electric power, [music] we first need to understand three important concepts related to it. These are voltage, electric current, [music] and resistance.

[00:01:53]First, let us talk about voltage.

[00:01:56]Voltage is a force that pushes electric charges through a wire. It is sometimes called electric pressure because it causes electricity [music] to move in a circuit. Without voltage, electric charges cannot flow.

[00:02:14]Examples of sources of voltage are batteries and electrical [music] outlets in our homes.

[00:02:20]Higher voltage can produce greater electric power because it pushes more electrical [music] energy through the circuit.

[00:02:30]Next is electric current. [music] Electric current is the flow of electric charges in a circuit. It tells us [music] how much electricity is moving through the wire.

[00:02:42]Current is measured in amperes or amps.

[00:02:45]When more current flows in a circuit, more electrical energy is transferred.

[00:02:50][music] This means that appliances may work stronger or faster.

[00:02:56]For example, a stronger [music] current can make a motor spin faster. It can also make a bulb shine brighter.

[00:03:06]The third concept is resistance. [music] Resistance is the opposition to the flow of electric current. It slows down or limits the movement [music] of electric charges in a circuit.

[00:03:20]Resistance is important because not [music] all materials allow electricity to flow easily.

[00:03:27]Some materials [music] resist the flow of electricity more than others.

[00:03:33]Resistance can also produce heat. This is why some appliances, such [music] as flat irons, rice cookers, become hot when electricity flows through them.

[00:03:45]>> [music] >> Now that we understand voltage, current, and resistance, let us move to the formula for electric power.

[00:03:54]The main formula for electric power is P is equals to VI where P stands [music] for power, V stands for voltage, I stands for current.

[00:04:08]This formula [music] tells us that electric power depends on both voltage and current. If voltage increases, [music] power also increases. The same happens when current increases. There are also other formulas [music] used in solving electric power problems.

[00:04:25]This formula is used when the values of current and resistance are known.

[00:04:32]This formula is used when voltage and resistance are given.

[00:04:36]These formulas helps us calculate the amount of electric power used in circuits and [music] appliances.

[00:04:44]Next, let us talk about the unit of electric power.

[00:04:48]The standard unit of electric power is called watt, >> [music] >> symbolized by the letter W.

[00:04:54]One watt is equals to one joules per second means one watt is [music] equal to one joule of energy used every second.

[00:05:05]Small appliances may use only a few watts while larger [music] appliances use hundreds or even thousands of watts.

[00:05:15]There are also larger units of electric power. The first is kilowatt or kW.

[00:05:20]>> [music] >> One kilowatt is equals to 1,000 watts.

[00:05:25]Kilowatts are commonly used for household appliances [music] and machines.

[00:05:31]Another larger unit is megawatt or [music] MW which is equal to 1 million watts. Megawatts are used in industries and power plants.

[00:05:41]Now, let us discuss the two types of electric power.

[00:05:45]The first type of electric power is direct [music] current or DC.

[00:05:49]In direct current, electricity flows in only one direction. Examples of [music] devices that use DC power are the batteries, the power banks, flashlights, [music] and mobile phones.

[00:06:04]The second type of electric power is alternating current or AC.

[00:06:10]In alternating [music] current, electricity changes direction repeatedly.

[00:06:15]This is [music] the type of electricity used in our homes and buildings because it can travel long distances efficiently.

[00:06:24]Examples of appliances that use in AC are electric fans, refrigerators, air conditioners, and televisions.

[00:06:34]>> [music] >> Electric power is very important in our daily lives. It is used in our homes, schools, hospitals, [music] factories, transportation, and communication systems.

[00:06:48]Without electric power, >> [music] >> many technologies and appliances would not function properly.

[00:06:54]However, >> [music] >> even though electricity is useful, it can also be dangerous if not handled properly.

[00:07:02]Some electrical hazards [music] include electric shock, overloading, and short [music] circuits. That is why we should always follow safety precautions.

[00:07:15]Here are some [music] important safety tips.

[00:07:17]Avoid touching exposed wires. Keep appliances [music] away from water.

[00:07:23]Do not overload electrical outlets. Turn off appliances when not in use.

[00:07:29]>> [music] >> There are also safety devices that protect electrical circuits.

[00:07:34]>> [music] >> The first one is the fuse.

[00:07:36]A fuse melts when too much current flows in a circuit, preventing the damage.

[00:07:42]The second one [music] is the circuit breaker.

[00:07:45]A circuit breaker automatically turns off electricity during overloads or short circuits.

[00:07:52]These devices help prevent electrical accidents [music] and protect appliances.

[00:07:57]By understanding electric power, we can learn how electricity works, how energy is consumed, and how to use electricity safely [music] and efficiently.

[00:08:09]Thank you everyone for listening, and see you to our next vlog. Bye-bye.

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