Class 12 Physics Notes Fbise A C Circuit Notes

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Class 12 Physics Notes Fbise A C Circuit Notes

Class 12 Physics Notes Fbise A C Circuit Notes

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Class XYZ Notes Physics Concept Questions Class 10 Electric Current Notes Chapter 14 Q.1) Since water is made up of atoms with protons (charge +e) and electrons (charge -e), does water flowing through a pipe carry an electric current? Please explain.

No, water flowing through pipes does not carry electricity. Electric current is the flow of electrons from the negative to the positive pole due to a potential difference. A water molecule is completely neutral and its movement does not create an electric potential difference. So there is no electric current in the pipe.

Kpk Class 11 Computer Science Notes Chapter 2 (computer Memory)

Q.2) A car has two lights, when the filament in one headlight burns out, the other stays on. Are the headlights connected in series or parallel?

The headlights are connected in parallel. In a parallel connection, the circuit has more than one flow path. So if one bulb burns, the resistance (filament) of the other bulb keeps the current flowing.

Q.3) Qurat-ul-Ain needs a circuit with 100 Ω resistors but has only a box with 300 Ω resistors. What can he do?

Class 12 Physics Notes Fbise A C Circuit Notes

You can put three 300 Ω resistors in series, this way you get the same resistance “R

Class 12 Physics Notes For Fbise (with Free Pdf)

Q.4) Several light bulbs are connected to the same electrical outlet. Will they provide more light when connected in series or parallel? Why?

If we want to get great light from light bulbs, we have to connect them.

Reason: When connected in parallel, the voltage across each bulb remains constant. So the luminance of each bulb will be the same and there will be no gradual dimming of the bulbs.

Q.5) Explain why light bulbs always burn immediately when they are lit and not after a long period of lighting.

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The function of a light bulb is to provide heat energy at the cost of electricity. In other words, they convert electrical energy into thermal energy, and a small amount is converted into light.

Question 6) Explain why birds can live safely on live wires without being electrocuted?

The legs of this bird are protectors. So the potential difference between the wire and the bird’s legs is zero. Therefore, it is possible for a bird to sit on a high voltage wire without being electrocuted.

Class 12 Physics Notes Fbise A C Circuit Notes

Q.7) An electrician who works on “live” circuits wears protective shoes and has one hand behind his back. Why?

Phys1112 Electricity And Magnetism Lecture Notes The University Of Hong Kong

An electrician wears covered shoes to protect himself from injury. This will prevent them from standing on their feet.

And the reason they keep one hand behind them is to reduce the chances of them catching a low wire or anything that moves.

Q.8) Explain why it is dangerous to light a light bulb in the bathtub?

The human body is a very good conductor of electricity and likes water. Therefore, if a person in the bathtub tries to turn on the light, they can receive an electric shock that can kill them.

Physics Notes For 10th Class Chapter 15

Circuit breakers, fuses and switches are installed on the “live wire” because it carries alternating current. If the current rises above the limit, it breaks the circuit.

Important questions stream class 10 Chapter no. 14 Q.1) Define electric current. In what units is it measured? Briefly discuss the electrical direction with the conductor.

“If one coulomb of charge flows through a conductor for one second, then the current produced in the conductor will be one ampere.”

Class 12 Physics Notes Fbise A C Circuit Notes

Direction of current through Kondi: The direction of normal current is the direction in which positive charges flow.

Solution Of Book Answers 2nd Physics

In conductors (e.g. metals), the main current flow is caused by electrons flowing from the negative pole to the positive pole of the battery. However, before the discovery of electrons, the positive pole goes to the negative pole of the battery and batteries.

In 1926, the German scientist George Simon Ohm did some experiments and noticed that if we keep the temperature and other physical conditions constant, then the current passing through an electric wire is directly proportional to the applied voltage.

According to Ohm’s law, if we connect a wire to a 3 V battery and another similar wire to a 1.5 V battery, the current in the first wire will be twice as large as it will pass through the second wire. There is another factor that affects the current in a wire known as resistance. Current and resistance are inversely proportional to each other, i.e. if we double the resistance, the current is halved.

An experiment set up to verify Ohm’s law is shown in figure (a). If we draw a graph between the applied voltage and current, we get a straight line as shown in figure (b).

Prove That An Ideal Capacitor In An A.c. Circuit Does Not Dissipate Power

Ohm’s law only applies to materials that are metallic conductors. And all those devices where the temperature cannot be kept constant, Ohm’s law does not apply.

According to Ohm’s law, resistance is the ratio of the voltage ‘V’ in a conductor to the current ‘I’ it carries, mathematically.

The resistance of the wire is one ohm

Class 12 Physics Notes Fbise A C Circuit Notes

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