Electricity

Question 1

Which equation can be used to work out the total resistance when all resistors are in PARALLEL and are EQUAL?

Answer 1

Rt=R/n

Question 2

Which equation can be used to work out the total resistance for any TWO resistors in PARALLEL?

Answer 2

Rt=R1R2/R1+R2

Question 3

What is the same across PARALLEL circuits?

Answer 3

Potential difference

Question 4

What is the same through all components in SERIES circuits?

Answer 4

Current

Question 5

What happens when current increases?

Answer 5

More electrons flowing per second
Current electrons collide with metal electrons
Electrons vibrate more
Temperature of metal increases
Current electrons find it harder to pass through metal
Resistance of metal increases

Question 6

What do Diodes require in order to work?

Answer 6

0.7V

Question 7

What happens when current is decreased?

Answer 7

Resistance decreases

Question 8

What is emf?

Answer 8

Emf is the potential difference of a supply when no current is being drawn

Question 9

What is Current?

Answer 9

The rate of change of charge

Question 10

What is Potential Difference?

Answer 10

Work done per Coulomb of charge

Question 11

What is Resistance?

Answer 11

Ratio of Potential Difference to Current

Question 12

What affects resistance?

Answer 12

Temperature
Cross-sectional area of wire
Length
Resistivity