Electricity

• Circuit symbols

  
• Charged objects create electric fields.
• An electric field is very similar to a magnetic field, but instead of a magnet at the centre of the field, we have a charged particle.
•  The electric field strength will vary depending on the distance from the object.
• Electric field

  
• Charged objects experience a force in an electric field.
• If we place one object into another object’s electric field, then it will experience a force. 
• Force strength varies with distance of objects in an electric field.
• Electric fields can cause sparking.
• The larger the charge difference, the stronger the electric field. 
• Electrical energy can be transported. 
• Electrical energy can be transported.
• The UK National Grid is able to transport the electrical energy from power stations to consumers
• Electrical energy transfers should be efficient.
• Transformers change the voltage of a circuit.
• Step-up transformers are used at the start.

  Step-down transformers are used at the end.
• a step-up transformer increases the voltage.
• a step-down transformer decreases the voltage and increases the current
• If an alternating current passes through a coil of wire, a changing magnetic field is produced.