Polarity of voltage drops
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Electrons flow from the negative terminal of a battery to the positive terminal, moving counter-clockwise through a circuit. The current entering one end of a resistor is negative relative to the current exiting the other end. Conductors are materials that allow the flow of electrons through their structure from particle to particle, permitting charge transfer across their entire surface. Common conductors include silver, copper, gold, aluminum, iron, steel, brass and bronze.
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To calculate the heat produced in a conductor, consider current I is flowing through a conductor AB of resistance R for time t. also consider that the potential difference applied across its two ends is V.
Now, total amount of work done in moving a charge q from point A to B is given by:
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and V = I X R (Ohm’s law)
Putting the values of q and V in equation (1), we get
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Or W = I2Rt
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(3) Faraday's first law of electrolysis states that the mass of a substance liberated at an electrode is directly proportional to the quantity of electricity passed through the electrolyte. His second law states that for the same current and time, the masses of elements liberated are directly proportional to their chemical equivalents.
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H I2Rt
Derivation of Formula
To calculate the heat produced in a conductor, consider current I is flowing through a conductor AB of resistance R for time t. also consider that the potential difference applied across its two ends is V.
Now, total amount of work done in moving a charge q from point A to B is given by:
W = q X V (1)
Now, we know that charge = current × time
or q = I X t
and V = I X R (Ohm’s law)
Putting the values of q and V in equation (1), we get
W = (I X t) X (I X R)
Or W = I2Rt
Now, assuming that all the work done is converted into heat energy we can replace symbol of ‘work done’ with that of ‘heat produced’. So,
H = I2RT
Applications of Heating Effect of Current
The heating effect of current is used in various electrical heating appliances such as electric bulb, electric iron, room heaters, geysers, electric fuse etc.
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Polarity of voltage drops
- 2. • The direction that electrons will flow in the same circuit.
- 3. •Starting at the negative (-) terminal and following through to the positive (+) terminal of the battery.
- 4. Electrons are moving counter- clockwise, from point 6 to 5 to 4 to 3 to 2 to 1 and back to 6 again.
- 5. •The current is entering is negative with respect to the end of the resistor it is exiting
- 6. CONDUCTORS
- 7. •An object or type of material that allow the flow of electrical current in one or more directions.
- 8. •A materials that permit electrons to flow freely from particle to particle.
- 9. •An object made of a conducting material will permit charge to be transferred across the entire surface of the object.
- 11. SILVER COPPER GOLD ALUMINUM IRON STEEL, BRASS AND BRONZE