Physics
Ch:12
Define and state it's SI unit
1. Electric current
2. Resistance
3. Resistivity.
State:
1. Ohm's law
2. Joule's law
List factors in which depends:
1. Resistance
2. Resistivity
Draw the symbols of the following
1. Battery of 3 cells
2. Ammeter
3. Voltmeter
4. 3 resistors in parallel
5. A plug key closed
6. A voltmeter
7. A circuit with above all
Find:
1.Current when 100C of charge passing through a conductor for 5 minutes.
2. Resistance of a bulb draws a current 0.2A from 220V line
3. Potential difference across the ends of a heater draws a current 5A having resistance 44 ohm
4. Combination of resistors to get a total resistance of 4ohm and 2 ohm with 3 resistors of each 6 ohm.
5. Current through each, total resistance when 3 resistors of 10,20,30 ohm connected in series to a battery of 10 V.
6.Current through each, total resistance when 3 resistors of 10,20,30 ohm connected in parallel to a battery of 12 V.
Define
Electric power and express it in terms of (I) I and V
(Ii) V & R
(Iii) I &R
Answers
Answer:
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Explanation:
Electric current-ampere/joules
Resistance/Resistivity-ohm(abohm-same)
states
ohm law
Ohm's law states that the current through a conductor between two points is directly proportional to the voltage across the two points. Introducing the constant of proportionality, the resistance, one arrives at the usual mathematical equation that describes this relationship: I=V/R, where I is the current through the conductor in units of amperes, V is the voltage measured across the conductor in units of volts, and R is the resistance of the conductor in units of ohms.
joule's laws are two: first about heat produced by an electric current, and second about how the energy of a gas relates to pressure, volume.
Joule's first law shows the relation between heat generated by an electric current flowing through a conductor. It is named after James Prescott Joule and shown as:
Where Q is the amount of heat, I is the electric current flowing through a conductor, R is the amount of electric resistance present in the conductor, and t is the amount of time that this happens for. Joule's second law says that the internal energy of an ideal gas does not change if volume and pressure change, but does change if temperature changes. Joule's law is important.
Factors
Resistance
When there is current in a conductive material, the free electrons move through the material and occasionally collide with atoms. These collisions cause the electrons to lose some of their energy, and thus their movement is restricted. This restriction varies and is determined by the type of material. The property of a material that restricts the flow of electrons is called resistance.
Resistivity
Resistivity is the property of the conductor to oppose the electric current to flow through it. when the electromotive force applied to the conductor electric current flows due to the movement of free electrons. These electrons collide with the atoms while moving. So the flow of the electrons is opposed. Due to this, some kinetic energy is converted into the heat energy. Crystals of the different materials are different. So all the matters do not oppose the flow of the current equally. So the resistance of different matter is different. Symbol of the resistance is R and its unit is ohm.
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