Potential difference class 10 | 10th physics chapter 14 potential difference | punjab, kpk, federal
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Potential difference class 10 | 10th physics chapter 14 potential difference | punjab, kpk, federal
47 919 просмотров · 6 лет назад
Atif Ahmad Official
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47 919 просмотров · 6 лет назад
Potential difference 10 physics or 10th physics chapter 14 potential difference in urdu / hindi.
14.2 POTENTIAL DIFFERENCE
When one end A of a conductor is connected to the positive
terminal and its other end B is connected to the negative
terminal of the battery, then the potential at A becomes
higher than the potential at B (Fig.14.6).
94
CURRENT ELECTRICITY
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K
-
Direction of current
V
V
Direction of electrons
A
B
This causes a potential difference between the two ends of
the conductor. The flow of current continues as long as
there is a potential difference. The agency which provides
the potential difference for the steady flow of current in the
copper wire is the battery. As the current flows from higher
potential to the lower potential through the conductor, the
electrical energy (due to current) is converted into other
forms (heat and light etc.).
When current flows through the conductor, it experiences a
resistance in the conductor by collisions with atoms of the
conductor. The energy supplied by the battery is utilized in
overcoming this resistance and is dissipated as heat and
other forms of energy. The dissipation of this energy is
accounted for by the potential difference across the two ends
of the light bulb. Thus
Potential difference across the two ends of a conductor
causes the dissipation of electrical energy into other forms
of energy as charges flow through the circuit.
SI unit of potential difference is volt. A potential
difference of 1 V across a bulb means that each coulomb
of charge or 1 ampere of current that passes through the
bulb consumes 1 joule of energy. When a bulb is lit, the
energy is taken from the current and is transformed into
light and heat energy.
14.3 ELECTROMOTIVE FORCE (e.m.f)
A source of electromotive force (e.m.f.) converts non electrical energy (chemical, thermal, mechanical etc.) into
electrical energy. Examples of sources of e.m.f. are batteries,
thermocouples and generators. When a conductor is
connected to a battery, current flows through it due to
potential difference.
For the continuous flow of current through a wire, battery
supplies energy to the charges. The positive charge leaves the
positive terminal of the battery, passes through the
conductor and reaches the negative terminal of the battery.
As a positive charge enters the battery at its lower potential
point (negative terminal), the battery must supply energy,
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Queries solved in this video
1. What is potential difference?
2. Explain potential difference?
3. Define potential difference
4. What does mean of potential difference?
5. Derive relation of potential differences.