Important Laws

Question 1

Kirchoff’s First Law (and the related conservation)

Answer 1

The sum of the currents entering a junction is always equal to the sum of the currents leaving a junction (conservation of charge)

Question 2

Kirchoff’s Second Law (and the related conservation)

Answer 2

The sum of the E.M.F is equal to the sum of the p.d in a closed loop (conservation of energy)

Question 3

Ohm’s Law

Answer 3

The current through a conductor is directly proportional to the potential difference across it, provided that the physical conditions remain constant

Question 4

Newton’s First Law

Answer 4

A body will remain at rest or continue to move in a straight line at a constant velocity unless an external force acts on it

Question 5

Newton’s Second Law

Answer 5

The resultant force on an object is proportional to the rate of change of momentum of the object, and the momentum change takes place in the opposite direction of the force

Question 6

Newton’s Third Law

Answer 6

If object A exerts a force on object B, then object B will exert an equal and opposite force on object A