why electricity needs to be earthed
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It doesn’t need to be earthed. Every electronic device with a 3rd prong will work just fine without it unless the manufacturer puts some safety interlock on there to make sure it is grounded. The ground on all 3 pronged appliances is there for safety. All appliances that have a metal case are require to be grounded in case there is a short that electrifies the case. If a short in the device gets shorted to the case without it being grounded touching the case would cause a shock. Since the case has a path to ground, any short to the case will cause the circuit breaker to trip. Some devices can detect current leaking to ground and simply shut down the device.
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