ELECTRICITY Flashcards
How are wires drawn
as straight lines, when they turn direction it is through a 90degree angle
power supplies/cells are usually drawn where in the circuit
at the top
components like lamps are usually drawn where in the circuit
at the bottom
current
flow of charge in a circuit
does current flow from positive to negative or negative to positive
positive to negative
if a circuit isn’t complete what happens?
the current cannot flow which means the bulbs won’t light up
what measures current
ammeter
what is the unit of current
amps
as the power supply increases what happens to the current
increases
as more components are added what happens to the current
decreases
voltage
push of energy from the power source
units of voltage
volts
how do you measure voltage
with a voltmeter
where is a voltmeter placed in a circuit
parallel with the cell or component
in a series circuit as the power supply increases what happens to the bulbs
they become brighter because more energy is being supplied to them
more lamps in a series …
the dimmer they are
series circuit, current
it is the same at all points in the circuit
resistance
property of a component which restricts the current in a circuit
the bigger the resistance, the _____ the current
smaller
resistance is measured in ______ and uses the sign ____
ohms, omega
resistance does what
opposes the flow of charge
RESISTANCE EQUATION
voltage / current
VOLTAGE EQUATION
current x resistance
CURRENT EQUATION
voltage / resistance
