Transcript y12.dc.circuits2 - ValentinesHighScience

Wordwall from last lesson recap…
EVALUATION:
MAKE SURE YOU EXPLAIN WHY THE
INTERNAL RESISTANCE IS 4V. USE
“imagine that the power source contains a
resistor before it reaches the parallel circuit”
Pupils found potential dividers easy
Jan 2011 q2©
An unusual use of an LDR
How can this work?
Learning Objective: To assess the use of
potential dividers
A – Link
potential
dividers and
multiple EMF’s
D – Explain
how multiple
EMF’s work
B – Evaluate
potential divider
variations
C – Create a
summary of a
potential divider
What do we
know about
Potential
difference
in parallel?
Where are some
potential differences
lost in circuits
Work out I 1,2
and 3 in this circuit
Why is I2
bigger here?
E.M.F. in a parallel circuit is constant, but
some potential difference is lost to internal
resistance
There is zero internal resistance in the
charging unit here
I2 is the same as I3
Learning Objective: To assess the use of
potential dividers
A – Link
potential
dividers and
multiple EMF’s
D – Explain
how multiple
EMF’s work
B – Evaluate
potential divider
variations
C – Create a
summary of a
potential divider
Potential dividers…
A potential divider is ……………
A potential divider looks like …………
For a potential divider using an LDR, Vout
would change if it was sunny compared to
cloudy by…
What can we calculate
about this circuit?
I'd like you to create a top 5
Most important
things to remember
With justification