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Physics ohm’s law

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Transcript of "Physics ohm’s law"

1. 1. It is the rate of flow of electric charge through a medium.This charge is typically carried by moving electrons in a conductor such as wire.Current flows from negative to positive on the surface of a conductor. It is measured in amperes or amps.
2. 2. A circuit needs three things to work:1. Power source2. A closed conductive path3. Resistor/Load
3. 3. Also called as: Electric Potential difference Potential drop Electrical potential difference and; Electrical potential
4. 4. Voltage is the difference in electrical potential between two points, or the difference in electrical potential energy unit charge between two points.
5. 5. Resistance is how much an object resists the flow of electrons.It is the inverse of conductance.It measures how difficult it is for electrons to flow through a material. It is measured in ohms.
6. 6.  Conductor – a material which contains movable electrical charges. In metallic conductors such as copper and aluminum, the movable charged particles are electrons
7. 7. Insulator – a material that is a poor conductor of electricity. › An insulator, such as ceramic or rubber, has high resistance and poor conductance. A metal has low resistance and high conductance
8. 8. Resistors – objects that are designed to have a specific resistance so that they can dissipate electrical energy or modify how a circuit behaves
9. 9.  Thenature of the material = Some materials are better conductors than others, causing less resistance
10. 10.  Thethickness of the conductor/wire = The larger the wire, the less resistance; the bigger the cross-sectional area of the wire the greater the number of electrons that experience the ‘electric slope’ from the potential difference.
11. 11.  The length of the conductor/wire = The longer the wire, the more resistance. The longer the wire, the less the volts each centimeter of it will get.
12. 12.  The temperature = Heat affects resistance; the higher the temperature, the higher the resistance
13. 13. Ohm’s Law describes mathematically the relationship between current and voltage (potential difference).
14. 14. I is the current through the conductor in units of amperes;V is the potential difference measured across the conductor in units of volts; andR is the resistance of the conductor in units of ohms.
15. 15. The potential difference (voltage) is proportional to the current through it. The current is indirectly proportional to resistance.
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