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Power dissipation calculation

Other Parts Discussed in Thread: TPL7407L

I have been reading the data sheet of TPL7407L.Now i have to find out the power Dissipation of the Transistor that drives the Relay with below specification.

Relay Rating-24v and 250mA

Transistor Input- 5v and 1mA

Please seggest how to calculate power dissipation clearly.

Thank you

Vijay Richard