The potential difference between the terminal of an electrical heater is 60v when it draw a current 4A fron the source. What current will the heater draw if the potential difference is increased to 120v?

The current through the heater is 8 A if potential difference is increased to 120 V.

Explanation:

That is, V ∝ I

⇒ V = IR where R is the constant of proportionality called resistance.

R = V/I = 60/4 = 15 ohm

I = V/R = 120/15 = 8 A

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. 

scientific laws are the result of testing theories and proving them to be facts.