electricity

• How do insulators produce a static charge?

  - 2 insulators are rubbed together which produces friction.

  - the electrons are transferred to the other material which results in one object having a positive electrostatic charge and the other having a negative electrostatic charge.
• How does a static charge occur on a conductor (eg. a car)?

  cars often get a static charge on the outside because they've gained or lost electrons from the air rushing past them as the travel at high speeds.
• How can a conductor be discharged safely?

  Connecting it to the earth with a metal strap. The electrons flow down the strap to the ground if the charge is negative and flow up the strap from the ground if the charge is positive.
• What happens when the electrical charge on an isolated object builds up?

  the voltage between the earth (has 0 volts) and th eobject increases.
• What happens to the electrons when an isolated object gets a large voltage (clue: sparks)?

  they jump across the small gap to an earthed conductor.
• What must i remember to place in front of the words 'conductors' and 'insulators'?

  Electrical
• What kind of force exists between like charges (postive and positive)?

  repulsion
• What kind of force exists between unlike charges (negative and positive)?

  attractions
• What happens to the forces as they get pulled further aprart?

  they forces get weaker
• Voltage?

  Energy transferred per charge
• Current?

  Charge which flows per second
• Resistance?

  Anything that slows the flow of electricity. If a component has a higher resistance, it will have a slower current.
• What is an alternating current (a.c)?

  The electrical current reverses its directions regularly or after a few cycles.

  Electronics which are connected to a plug or mains supply use a.c