science rotation 1 yr 9 Flashcards
(23 cards)
Alternator
a device that converts kinetic energy into electrical energy
Fossil fuel
an energy source made of ancient fossils
Generate
to make or produce something
Non-renewable
finite, and will run out
Renewable
can be renewed and will not run out
Solar energy
energy from the Sun
Electric circuit
An electric circuit is a closed loop that provides a path for the transfer of electrical energy from a battery or power pack to an electrical component.
Electricity
Electricity is actually the flow of electrons through a conductive material.
Direction of electrical flow
In a complete circuit,
electrons move around
from the negative
terminal to the positive
terminal.
voltage
VOLTAGE is often referred to as electrical pressure/push because it
‘pushes’ electrons to move.
current
CURRENT is the amount
of charge that passes
through a certain point in a
circuit. Current is described
using the symbol I. It is
measured in Amperes or
‘Amps’ (A).
resistance
Resistance is the restriction of electron flow. Resistance usually leads to energy converted into heat and light.
voltmeter
An instrument to measure voltage
ammeter
An instrument to measure current
volt
The unit for voltage
ampere
The unit for current
ohm
The unit for resistance
what is the equation for ohms law
V = I x R
qualities of a series circuit
Current only has one path.
Globes are dependent on each
other (if one goes out, they all go
out).
Resistance increases with more
globes (more globes = dimmer
light).
Voltage is shared between globes.
qualities of a parallel circuit
Current has separate paths.
Globes are independent (can still work
even if another goes out).
Brightness does not decrease by adding
more bulbs.
Full voltage is used by each globe.
how to you measure current
To measure current, we
must use an AMMETER. In a
circuit, the ammeter can be
connected anywhere in
SERIES.
how to measure voltage
To measure voltage, we must use an VOLTMETER.
In a circuit, the voltmeter must be connected in
PARALLEL to the component you want to measure.
what is the equation for power/watts
P = V x I
