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The diagram shows a simple generator connected to a lamp - Edexcel - GCSE Physics - Question 6 - 2013 - Paper 1
Question 6
The diagram shows a simple generator connected to a lamp. The magnet is made to spin at a steady speed. The ammeter gives a reading of 1.5 A. The voltmeter gives a ... show full transcript
Worked Solution & Example Answer:The diagram shows a simple generator connected to a lamp - Edexcel - GCSE Physics - Question 6 - 2013 - Paper 1
Step 1
Step 2
Step 3
Describe the difference between charge movement in a direct current and in an alternating current.
Answer
In a direct current (DC), the flow of electric charge is unidirectional, flowing in one direction only. In contrast, in an alternating current (AC), the flow of charge reverses direction periodically, moving back and forth.
Step 4
Compare the modern National Grid system with the early system in New York.
Answer
The modern National Grid system is designed to distribute electricity over vast distances, ensuring a stable and consistent supply of power to homes and industries. It utilizes alternating current (AC) that can be transformed to different voltages, which reduces energy loss over long distances. In contrast, the early system in New York relied on direct current (DC) that could only supply limited areas and required underground cables, greatly restricting its reach. The early system mostly provided electricity for electric lights, whereas the National Grid supports a wide range of electrical needs and can supply entire regions, making it far more efficient.