10.7 Part 2 Flashcards
How is volts made-equation
V= I x R Voltage = current X resistance
How is current made-equation
I= V/R
Currnet=voltage divided by resistance
How is resistance created-equation
R=V/I
resistance = voltage divided by current
How do you increase current according to ohms law
increase the voltage in a
circuit while the resistance is
the same,
How do you decrease current according to ohms law
increase the resistance
in a circuit while the voltage
stays the same,
Light Dependent Resistors (LDRs)
use
light to change the amount of
electrical current that moves through
a circuit
Synonym for light dependent resistors
photoresistors
What happens if a lot of light shines of a LDR
the less it resists the flow of electrons
and the more current is allowed to
flow through the circuit.
What kind of resistance do LDR provide in the dark
high resistance because little current can flow through an LDR(in the dark)
Temperature-dependent Resistors
devices that change their resistance when
the temperature varies, which affects the amount
of current flowing through a circuit.
What happens if there are high temperatures on tempertuare-dependent resistors
Lower resistance which creates a large current flow
another word for Temperature-dependent Resistors
thermoresistors.
Where are thermoresistors found
thermostats, refrigerators,
electric cookers,
where are LDRs found
street lights, night lights and
camera light meters (to automatically
turn the lights on and off.)
How many volts in a power supply
240 volts
What does the earth wire do
The earth(green and yellow) connects the power point to the earth beneath you.
what does the neutral wire do
The neutral (blue) carries current away from the powerpoint
what does the active wire do
The active wire(current) carries current to the
power point.
Ho w do you increase resistance
Increase voltage
How do you decrease resistance
decrease voltage
