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- 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. A circuit needs three things to work:1. Power source2. A closed conductive path3. Resistor/Load
- 3. Also called as: Electric Potential difference Potential drop Electrical potential difference and; Electrical potential
- 4. Voltage is the difference in electrical potential between two points, or the difference in electrical potential energy unit charge between two points.
- 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. Conductor – a material which contains movable electrical charges. In metallic conductors such as copper and aluminum, the movable charged particles are electrons
- 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. Resistors – objects that are designed to have a specific resistance so that they can dissipate electrical energy or modify how a circuit behaves
- 9. Thenature of the material = Some materials are better conductors than others, causing less resistance
- 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. 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. The temperature = Heat affects resistance; the higher the temperature, the higher the resistance
- 13. Ohm’s Law describes mathematically the relationship between current and voltage (potential difference).
- 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. The potential difference (voltage) is proportional to the current through it. The current is indirectly proportional to resistance.

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