The big question:How do Kirchoff’s laws link with voltage, resistance and electrolysis

Why are we learning this?One use of electrolysis and Kirchoff’s laws is hair removal

$45 / £35 per 30 minutes

Electrolysis…

Match up the words to the definitions (Wordwall)

Question to be asking

ANSWER

What are the babyand the dog doing?

What is the facebook command it showsWhat is the voltage in the series circuit?

What is the voltage in the parallel circuit?

EQUAL

Learning Objective: To combine understanding of Kirchoff’s laws with other concepts

The big question: How do Kirchoff’s laws link with voltage, resistance and electrolysis

A – Analyse circuits with different value resistorsB – Predict currents using digital ammeters and Kirchoff’s lawsC – Calculate current using same value resistorsD – Investigate electrolysis

Electricity ALWAYS takes the easiest routeIf electricity cannot take the easiest route, it equally divides

Make up this circuitPredict what current will be at A and B

Measure current in A and B

A

B

Same resistance

For these circuits, make them and test currents at A, B and C each time

Also provide circuit diagrams A

B

A B C A B C C

Provide an explanation for whychanges each time

Learning Objective: To combine understanding of Kirchoff’s laws with other concepts

The big question: How do Kirchoff’s laws link with voltage, resistance and electrolysis

A – Analyse circuits with different value resistorsB – Predict currents using digital ammeters and Kirchoff’s lawsC – Calculate current using same value resistorsD – Investigate electrolysis

So…This is a 12V cellCalculate currentat each point if…

(C) R1=R2=R3, and at 8 there is 10A

(B) R1 is twice R2 and R3 and at 8 there is 10A

(B) R1=R2, R3=R1+R2. At 8 there is 12A.

So…(A) This is a 12V cellCalculate the Relative valuesof R1, R2 and R3, if

4 is 5A, 3 is 15A and 2 is 20A

4 is 12A, 3 is 18A and 2 is 21A

So…(A) This is a 12V cellCalculate the Relative valuesof R1, R2 and R3, if

4 is 5A, 3 is 15A and 2 is 20A

4 is 12A, 3 is 18A and 2 is 21A

Learning Objective: To combine understanding of Kirchoff’s laws with other concepts

The big question: How do Kirchoff’s laws link with voltage, resistance and electrolysis

A – Analyse circuits with different value resistorsB – Predict currents using digital ammeters and Kirchoff’s lawsC – Calculate current using same value resistorsD – Investigate electrolysis

How do you do it?A – You are given current for two resistors in parallel, and a voltage. You have to calculate the resistance

B – You are given the different resistance of two resistors in parallel and a voltage. You have to calculate the current.

C – You have two equal resistance resistors in paralell and a voltage. You have to calculate current

Test next lessonRead up on digital ammeters (hwk)

Ext: q1 jun 2009