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P1 generate electr

Edexcel P1 generating electricity

QuestionAnswer
What happens when you move a magnet near a wire? An induced current is produced
What happens when you move a wire near a magnet? An induced current is produced
What is an induced current? The current produced when a magnet moves near a wire (or vice-versa)
Name 3 ways of increasing an induced current more coil on the wire; a stronger magnet;moving the wire (or the magnet) faster
What is direct current (DC)? A current that flows always in the SAME direction.
Name objects that use direct current Torches, wind up radios.
What is alternating current (AC)? A current that CHANGES direction many times per second
What type of magnets are used in power stations? Why? Electromagnets are used because they can be made to be really strong magnets (much stronger than "natural" magnets)
What is inside a generator? A coil wound up around an iron core; the coil turns around permanent magnets.
How can you reverse the direction of an induced current? Swap the magnet around; or make it go in the other direction
What type of current is produced in power stations? Alternating current
What is the voltage produced in power stations? 25 000V (aka 25 kV)
What is the voltage when transported in transmission lines? 400 000V (aka 400kV)
What is the voltage used at home? 230V
Why is voltage increased before being sent through the National Grid? So that less energy is wasted in heat during transport.
What happens when electricity is passing through a wire? The wire heats up
What is used to increase the voltage? A step-up transformer
What is used to decrease the voltage? A step-down transformer
A transformer has 100turns of wire in the primary coil and 20 in the secondary coil. If you input 20V, what will be the voltage coming out? Four
A laptop runs on the mains (230V) but only needs 20V supply. How many coils in teh secondary coil, if the transformer has 100coils in the primary coil? Nine
Why are the transmission lines placed so high Because the voltage could kill you
Why are birds not electrocuted? Both their feet are at the same voltage
Describe the stages electricity is transmitted to your homes Power stations generated electricity; a step-up transformer raises the voltage; the current goes through transmission lines; a step-down transformer reduces the voltage before the current arrives to our homes.
Describe the difference between direct current and alternating current.
The output from the solar panel is 60 V. State why a transformer cannot be used to increase this voltage.
Explain why using solar panels to generate electricity for the National Grid benefits the environment.
The cost of the solar panel is £4800. The solar panel supplies an average of 800 kW h of electrical energy to the National Grid each year. The homeowner is paid 40p for each kW h of energy supplied to the National Grid. Calculate the payback time.
Created by: ursulinephys