(The Conversation) - How many chargers do you own? We’re surrounded by rechargeable electronic devices – mobile phones, laptops, smart watches, headphones, e-bikes and more.

You might have a phone charger plugged in next to your bed without ever bothering to switch it off at the wall or unplugging it when not in use. The same might go for a laptop charger by your desk.

But is that risky to do? And are there hidden costs associated with leaving chargers plugged in all the time?

What’s inside a charger?

Naturally, not all chargers are the same. Depending on the application and power requirement, their internal structure can range from very simple to complex.

However, a typical charger takes in the AC (alternating current) from the wall plug and converts it to a low-voltage DC (direct cu

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