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What is a step up transformer?

What is a step down transformer?

Can electrical current flow between the coils in a transformer?

What are switch mode transformers used for?

How much power do switch mode transformers use in comparison to a regular iron core transformer?

What is the frequency of a switch mode transformer in comparison to a regular transformer?

Why are switch mode transformers good as mobile phone chargers?

Why is a high potential difference wanted in the National Grid?