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?

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 current) suitable for your device’s battery.

To understand the difference between DC and AC, consider the flow of electrons in a wire. In a DC circuit, electrons........

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