10.1

Question 1

What is Kirchhoff’s second law

Answer 1

In a closed loop of an electrical circuit, the sum of the emfs is equal the sum of the pds

Question 2

What is known about series circuits

Answer 2

• Current is the same in every position

• emf is shared between every component
-adding a component in series reduces the emf shared in other components (other loops) (including in parallel)

• Greater resistance will take more emf

• Multiple emf sources need to be totalled and the same rule applies
-If polarity is opposite then subtract (negative addition)

Question 3

What is known about parallel circuits

Answer 3

• The current into each junction is equal to the current out of each junction
• Branches with greater resistance have lower currents
• if one has half resistance, twice current
• two-thirds of total current will run through other junction (ratio 2:1)

• Each branch is thought of as its own circuit
-If changes are made to one branch, others are unaffected

• The pd in each branch is the same as the emf
-if one branch contains multiple components then the sum of the pds in that loop equals the emf