Calculate the value of e^-t/CR correct to 6 d.p using the power series for e^x with an appropriate number of terms, given that t=2.2ms, C=1uF and R=200Kohms.

Check and compare your result with your calculator.

I've never used a power series before so could somebody explain it carefully please, its for my HNC in electrical engineering assignment.

Thanks alot!

Dan