3.6

Question 1

What is Ohms law?

Answer 1

Current through a piece of material at a constant temperature is directly proportional to the voltage across it. V= I x R

Question 2

What is Kirchhoff’s first law? (Current)

Answer 2

At any junction in an electrical circuit, the sum of currents flowing towards that point is equal to the sum of currents flowing away from it.

Question 3

What is Kirchhoff’s Second law? (Voltage)

Answer 3

Kirchhoff’s Voltage Law states that the algebraic sum of all voltages around any in a closed loop is zero.

Question 4

How do you calculate terminal voltage?

Answer 4

Vt= E(EMF)-IR(internal resistance)

Question 5

Power supplies have IR which limits the minimum current that can be drawn from them, true or false?

Answer 5

False, Power supplies have IR which limits the maximum current that can be drawn from them

Question 6

What does Internal resistance depend on?

Answer 6

depends on the type of power source

Question 7

What are the dangers and limitation of Internal resistance in a power supply?

Answer 7

If an IR is low it can cause a very high short circuit current that can destroy the power source.
Supplies should not be connected to circuits that draw more than the maximum stated current