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CP11F

GCSE Combined Science Physics

QuestionAnswer
What is the national grid ? This is system of wires and cables that bring electricity from the power system to our homes and other buildings.
Where is energy lost in the national grid? By heating of the transmission lines.
What happens if the voltage (potential difference ) across the transmission wire is increased? The current decreases.
Why do we transmit electricity at low currents? "Less energy is dissipated at heat to the surrounding air and it is more efficient.
" Current which regularly changes direction is called… alternating current
An example of alternating current is…? mains electricity
Current which flows in one direction is…? direct current
An example of direct current is… batteries
What is the potential difference of mains electricity in the UK? 230V
What is the frequency of the alternating current in UK mains electricity? 50Hz
The national grid consists of…? Cables and transformers
Are power stations par of the national grid? no
What does a step up transformer do? Increases p.d.
What does a step down transformer do? reduces p.d. to 230 V
Why are transformers used? reduce current so that less heat is lost in cables, increases efficiency
What are the names o the two wires in a transformer? Primary and Secondary coil
A step-up transformer has more turns in the _______ coil. Secondary coil
A step-down transformer has more turns in the _______ coil. Primary Coil
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