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I'm really struggling with the following electricity questions and so any help would be very much appreciated.

**How many available electrons are there in a 25 Ah battery?**

How many electrons pass through a 240 V mains shower heater of 8 kW if it is on for 5 minutes?

How many electrons pass through a 240 V mains shower heater of 8 kW if it is on for 5 minutes?

Thank you.

Cathy