Resistance

Question 1

What is resistance ?

Answer 1

The opposition or restriction to the current flow in a circuit

Question 2

What happens to the resistance if the pipe narrows?

Answer 2

Greater the resistance , current will always take the path of least resistance

Question 3

What will a thicker conductor do?

Answer 3

More free electrons than a narrower one so it will offer less resistance

Question 4

What are the 4 things that’ll effect resistance ?

Answer 4

• Length -longer the conductor the greater the resistance
• Cross sectional area- larger the CSA, the more current that can flow
• Material
• temperature- hotter the material, the resistance will increase

Question 5

What is positive temperature coefficient?

Answer 5

As a material becomes hotter, the resistance will Increase

Question 6

Keeping the temperature constant will cause the other factors to do what?

Answer 6

Change in proportion to each other

Question 7

What is resistance measured in?

Answer 7

Ohms

Question 8

If a material is experiences a drop in resistance as the temperature increases, this is called what?

Answer 8

Negative temperature coefficient

Question 9

If you keep the applied voltage constant then what can be altered?

Answer 9

Current can be increased or decreased

Question 10

What is a resistor ?

Answer 10

A component designed to deliberately reduce the amount of current flowing in a circuit

Question 11

What can too much current cause?

Answer 11

Excessive heat dissipation which can cause damage and a fire hazard