7. The diagram shows a design for an electrically operated model railway signal a) Explain, step by step, how it works.
b) Explain how, by adding a scale and a spring, you could use it as an ammeter.

(Diagram in attachment)
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the only real purpose of sputnik 1 was to beat the us into space. we were getting close to launching a useful satellite, explorer 1 - which launched on january 31, 1958. the ussr had to beat that, so they launched sputnik 1 on october 4, 19

technology is the application of the knowledge gained by science.