Measurement of potential difference class 10 | voltmeter class 10 | how to connect voltmeter

Measurement of potential difference and EMF 10th physics chapter 14 | Voltmeter 10th physics | urdu hindi

The Measurement of Potential Difference
The potential difference across a circuit component (e.g. light
bulb) can be measured by a voltmeter (Fig. 14.7) connected
directly across the terminals of the component. The positive
terminal of the battery is connected to the positive terminal of
the voltmeter and the negative terminal of the battery is
connected to the negative terminal of the voltmeter.
An ideal voltmeter should have very large value of resistance
so that no current passes through it. Voltmeter is always
connected in parallel with the device across which the
potential difference is to be measured .(Fig. 14.8)
Fig.14.7: A voltmeter
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The Measurement of e.m.f
In general, e.m.f refers to the potential difference across the
terminals of the battery when it is not driving current in the
external circuit. So in order to measure e.m.f of the battery
we connect voltmeter directly
SUMMARY

The time rate of flow of electric charge through any cross section is called electric
current.

The current due to flow of positive charge which is equivalent to current due to flow
of negative charge in opposite direction is known as conventional current.

Ampere is the SI unit of current.

e.m.f. is the total amount of energy supplied by the battery or the cell in moving a
one coulomb of positive charge from the -ve to the +ve terminal of the battery.

Ohm's law states that the current I passing through a conductor is directly
proportional to the potential difference V applied across its ends provided the
temperature and physical state of the conductor do not change.

Resistance R is a measure of opposition to the flow of current through a conductor.
Its SI unit is ohm. It is denoted by the symbol Ω. When a potential difference of one
volt is applied across the ends of a conductor and one ampere of current passes
through it, then its resistance will be one ohm.

Materials in which electrons can freely move so as to pass electricity are called
conductors while in insulators no free electrons are available for the conduction of
electricity.

The equivalent resistance R of a series combination of ‘n’ resistances is given by e

The equivalent resistance R of a parallel combination of ‘n’ resistances is given by e

Galvanometer is a sensitive instrument which detects current in a circuit. It is always
connected in series with the circuit.

Ammeter is an electrical instrument which measures larger current. It is always
connected in series in a circuit.

Voltmeter is an electrical instrument used to measure potential difference betw
The amount of heat energy generated in a resistance due to flow of electric current
is equal to the product of the square of current, resistance and the time interval ( W
2
= I Rt). This is called Joule's law.

kilowatt-hour is the amount of energy obtained from a source of one kilowatt in one
hour. It is equal to 3.6 mega joule.

The current which does not change its direction of flow is known as direct current or
d.c.

The current which changes its direc
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[sherazkhan-rqgg]

Sir u teach that there is no opportunity to ask the question well done and your teaching style is so amazing I am so excited when ever I watch your videos

[Malikyasen-vm]

Sirji. Allah. will. success. you. in teaching

[LionofAllah]

Thankx atif sir love from Palestine ❤❤❤❤❤

[sherazkhan-rqgg]

Thank you sir give us more that type of concept

[saqibahmad]

Sir afka teaching buhut acha hain.Nice

[syedaaliyarubab]

Great Sir you are doing an amazing job keep it up❤

[seemanazir]

Sir please also mention lecture no. With every video

[sadafikram]

Is there any charge in voltmeter??
When positive terminal of battery is connected to positive terminal of voltmeter then there is similar charges, similar charges are repel each other .then how we measure potential difference??

[yaceenarz]

sir
pd measure krty huwe voltmetr ki resistance ko q high rkha jata h??

[sohaibahmad]

Yad bo gya jis ko measure karna h usko divide ni hone dena😁

[aryahaleem]

Sir ye konse sube ka course hai plz batade??

[haleemaarshad]

Sir isme conductor ko hi resistior kaha jaraha he?

[zeyanpubg]

Sir Emf me bulb ni ha to parralel me kaisa connect h volt meter

[HamzaGul-hksj]

Very bad just time wasting 5 min lecture converted into 15 min