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Pig – P4 (a to d) Foundation What are the names of the two types of charge? Explain what happens to the cloth and the rod when they are rubbed together? (3 marks) Why is static a danger when a plane refuels? How is a defibrillator used to restart the heart (3 points) How does a paint sprayer use static electricity, include one advantage (4 points) Correctly name the wires in the plug (which colour is which) Name two uses of ultrasound, other than body scans? (2 marks) How does a fuse work? (3 points) Which letter shows amplitude and which letter shows wavelength? A D B C Which shows a longitudinal wave and what is a compression? A B What is the job of the Earth, Live and neutral wire? If an appliance is double –insulated it does not need an earth wire why? How does a variable resistor affect the current in a circuit?