2.
QUESTIONS TO ANSWER
How can the resistance of an ohmic conductor be
described?
What about non-ohmic conductors?
What is an ohm literally a measure of? (ie. something
per something)
What is Ohm’s law and does it apply to both ohmic
and non-ohmic conductors?
3.
QUESTIONS TO ANSWER
Wires are designed to offer as little resistance as practially
possible. Find out how the following characteristics of a wire
affects its resistance:
Length
Diameter
The type of metal used (eg. compare copper and silver)
What is the equation that describes the relationship
between these three factors?
Design a more efﬁcient wire.
4.
If normal household copper wiring is 1.8mm in
diameter, use the formula from the previous question
to ﬁnd out the resistance of a 10m long piece. Then
ﬁnd out what voltage drop you would get if a current
of 10A ﬂowed through it.
Compare the voltage drop of the normal household
wiring from above with a 10m length of your new and
improved wiring. How much more efﬁcient is your
wiring? Would it be worth the extra cost?
6.
CALCULATING ENERGY AND
POWER
What is the formula for calculating electrical energy?
What is the unit it is measured in?
What is the formula for calculating electrical power?
What is the unit it is measured in?
Convert joules into the more well-known unit for
measuring power: kilowatt hour (kWh). How many joules
are in 1kWh?
How much does your household pay per kWh (refer to an
electricity bill).
¿Le ha llamado la atención una diapositiva en particular?
Recortar diapositivas es una manera útil de recopilar información importante para consultarla más tarde.
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