ohms law

• electric current (I)

  • the rate of flow of electric charges from one point to another in a circuit.
  • It is measured in Amperes (A).
• Voltage (V)

  • the pressure from a power source that pushes charged electrons; what makes a current move
  • Measured in volts (V)
• Resistance (R)

  • the opposition to the flow of current by the conducting wire.
  • Electrical resistance is measured in ohms (Ω), named after Georg Simon Ohm.
• Electrical resistance decreases the amount of current that flows in a circuit, depending on the material’s:

  ● conductivity

  ● thickness

  ● length
• Ammeter: An instrument used to measure the current in the circuit.
• Voltmeter: An instrument used to measure the voltage in a circuit.
• The relationship among voltage, current, and resistance is summarized by Ohm’s law.
• Ohm’s law states that voltage is directly proportional to current under constant resistance.
• Ohm’s law tells us that to increase the amount of current in a circuit, we can do two things: increase the voltage or lower the resistance.