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Stack #4692220

QuestionAnswer
What are the two types of potential difference? Alternating (AC) Direct (DC)
What is direct proportional difference? When current always flows in the same direction
What is alternating potential difference? When the potential difference fluctuates between positive and negative
Define mains electricity. An AC supply, which in the UK has a frequency of 50 Hz a value of 230v
Mains electricity is distributed around the UK using what? The national grid
What is the name and function of the yellow and green wire? The Earth wire is a safety wire that stops the appliance from becoming live (0v)
What is a neutral wire and what colour is it? The neutral wire is blue and carries the current from the appliance to mains (0v)z
What is the job of a fuse? It melts when the current is too large and breaks the circuit
What is the colour and name of the wire that carries alternating current from the mains into the appliance (230v)? The brown wire is called the live wire
Why do we get an electric shock when we touch a 240 volt kettle? Because we are 0 volts the potential difference makes the electricity flow through the person
Give two equations for energy per second. E=Pt (Energy per sec= power x time) E=Qv (Energy per sec= charge x Potential Difference)
Give 6 examples of advantages of nuclear power. No carbon dioxide emissions, cheaper to run once built, conserves fossil fuels, no sulfur dioxide emissions, safe under normal conditions and small amount of fuel used so less transport needed.
Give 6 examples of disadvantages of nuclear power. Expensive to build, non-renewable, produces radioactive waste, risk of disaster, links with cancer, expensive to decommission
What is the national grid? The network of cables and transformers that distribute electricity from where it is generated to homes and factories.
what do step-up transformers do? Increase the overall efficiency by increasing the potential difference and decreasing the current
How is the minimum amount of power is lost from the cables? Cables are thick so their resistance is low, high voltages are also used to reduce the current through the transmission lines, which means the the transmission wires won't heat up as much
Name 7 renewable energy sources. Biomass, Solar, Wind, Tidal and wave power, Nuclear, Geo-thermal, Hydro-electric
Explain why an electrically charged balloon is able to make water bend. The negative charge of the balloon repels the negative charge of the water. The water closest to the balloon becomes positively charged and then the positively charged water is attracted to the negatively charged balloon, which bends the water.
Why would a polythene rod become negatively charged after being rubbed with a woollen cloth? The electrons from the cloth transfer to the rod due to friction.
Give the two equations for power. P=IV (Power= current x potential difference) P=I²R (Power= current squared x resistance)
Created by: user-2044977
 

 



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