Notes Flashcards
voltage is the sepration between
negative and positive charges
what does an electirc circuit need to consist of?
1 voltage source (seperation of charge)
2 wire made of conductive materials (conductors)
3 consumer
how many branches does a series circuit have?
none. there is just 1 current loop
how do you calculate power?
energy over time
a.k.a
e over t
what is power measured in? (unit)
watts
a.k.a
W
how do you calculate power?
voltage x current
a.k.a
v x I
how do you calculate energy?
power x time
a.k.a
p x t
how many mA is 1A
1000
which is conductor\insulator?
A aluminium
B graphite
C glass
D PVC
E copper
F rubber
G steel
a conductor
b conductor
c insulator
d insulator
e conductor
f insulator
g conductor
in a calculation, if you have units of volts and wats, does the energy need to be in
A A (amper)
B mA (milli-amper)
A
the magnitude of current is measured in __
Amperes (A)
list 2 advantages and 1 disadvantage of LEDs
2 advantages:
- LED lasts much longer then bulbs
- LED uses much less electricity then bulbs
(conc: their overall cost is slightly lower then bulbs)
1 disadvatnage:
- they are more expensive to buy (though that will be earned back later)
what unit is energy measured in?
Joules (J)
how to calculate time, given energy and power?
energy over power
how to calculate energy given time and power
power x time
how to calculate current igven power and voltage
power over voltage
hwo to calculate voltage given current and power
power over current
conversions (base unit, milli and kilo)
To convert milli (m) to base unit → divide by 1000
To convert base unit to milli (m) → multiply by 1000
To convert kilo (k) to base unit → multiply by 1000
To convert base unit to kilo (k) → divide by 1000
