Electromotive Force of a Battery, Internal Resistance and Terminal Voltage

This physics video tutorial provides a basic introduction into the electromotive force generated by a battery. The electromotive force is a voltage source that increases the electric potential energy of the charges in the circuit that allows it to do useful work. Resistors, on the other hand absorb energy from the circuit and reduces the electric potential energy of a charge as it moves through the resistor causing a voltage drop. This video the difference between the electromotive force of a battery and the terminal voltage across a resistor connected in parallel to a battery. The terminal voltage is always less than the electromotive force of a battery due to the internal resistance of the battery.

Electric Current In Circuits:

The Electric Battery:

Ohm's Law Problems:

Resistance and Resistivity:

Resistor Color Code:

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Internal Resistance of a Battery:

Drift Velocity and Current Density:

Potential Difference Between Two Points:

Alternating Current Vs Direct Current:

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Schematic Diagrams & Symbols:

Open, Closed, and Short Circuits:

Resistors In Series:

Resistors In Parallel:

Physics PDF Worksheets:

[patrickfoo]

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[Aalijah_Matyevna]

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[maseeha.m.i]

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[lightwing]

The first 20 seconds cleared up quite a lot for me.

[marksanta]

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[bassantnasser]

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[EmmanuelRume]

Best explanation ever about emf and potential difference at the same time

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[johnholme]

Simple no nonsense explanation. Thank you.

[nadiraakhter]

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[The]

Thank you so much for clearing up EMF.
I couldnt for the life of me understand internal resistance because my professor spent the entire time teaching us how to derive the super drawn out formulas and then tried to cover all of circuit 1 in the span of an hour. And hes a physics 2 professor. Internal resistance is basically like resistor being akin to a rope being pulled. The stronger the resistor the more it pulls out of the battery. The weaker the resistor the more the battery pulls back. In a sense lol

[noiiiiiiiiiiiii]

It was really helpful. Thank you so much. But a liitle about how is emf generated would make it more clear 😊😊

[mwangimacharia]

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[valdachef]

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[somnathpaul]

Sir, could you please explain the emf now in terms of flow of electron rather than current? Thank you, it was a great explanation.😊

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[rivinhewage]

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[orangecaprinun]

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[texastexas]

Please clarify the following. You say electrons move from positive terminal to negative terminal and the battery adds energy to these electrons (see your arrows). But electrons MUST travel from negative to positive is the only way they can go. NOTHING is moving from positive to negative terminal. Electrons are produced by oxidation reactions at the negative terminal and they get absorbed by reduction at positive terminal. New electrons are produced again and the whole thing happens again. I am confused by your description. Also, PLEASE tell me which way is the electrical vector pointing.