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9J Force Field and Electromagnets (9Jd Resistance (calculating resistance,…

- - - - mass is how many matters (particles) is in an object, weight is the amount of force which gravity pulls things.
    - - This means that the force of attraction between the Earth and a 1kg mass in 10N.
        
        weight(N) = mass (kg) x gravitational field strength ()
- - - - positive charges cannot be transferred because they are fixed in the nuclei of the atoms.
        
        Object ends up with more electrons have negative charge, object lost electrons ends up with positive charge.
- - - - measure current
      - unit: amperes (A)
    - - unit: volts(V)
      - measure volts
        
        a measure of energy transferred by the component
- - - - voltage increase if (larger current) or (high resistance)
- - - - do not have to touch the circuit carrying large current
  - - - a wire carrying current place in a magnetic field of a magnet
        
        two magnetic field affect each other and the wire experience a force
      - direction depends on the direction of the current and the magnetic filed
    - - they made the coil spin