F the voltage in a circuit is 80 volts and the resistance is 20 ohms, what is the current?

I = 4 A

Explanation:

From Ohm's law, the voltage is given by

V = IR

or

I = V/R = (80 V)/(20 ohms)

= 4 A

if you already have the answer to (a), then just work out how many periods there are in 1 minute, and that's the answer to (c).

the working equation for the angular size is the product of the physical size and 360 degrees divided by the product of two pi and distance from earth. the minimum size would be 0.559 degrees while the maximum size would be 0.49 degrees.