A) A student performs an experiment and plots the V-I graph of series and parallel combination of two resistors. Which graph represents series combination of resistors? Justify your answer.

b) Define joules law of heating
c) 100 J of heat are produced each second in a 42 resistance. Find the potential difference
across the resistor.

b) Joule's law is that the heat evolved per second, or the electric power loss, P, equals the current I squared times the resistance R, or P = I2R. The power P has units of watts, or joules per second, when the current is expressed in amperes and the resistance in ohms.

Explanation:

c) P= v2÷R

PR=V×V= 100×42=4200

v=sqroot 4200= 64.8volts

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.

technology is the application of the knowledge gained by science.