Current Electricity Flashcards
What is current
Rate of flow of charge
Power=
Power =current x voltage
P=IV
What is voltage
Amount of energy per coulomb
How much energy per coulomb is there in
A)1volt
B)60volts
1 joule per coulomb
60 “
What is potential difference and how is it measured
Voltage
Measured using voltmeter
Describe current in a series circuit
Always the same anywhere in the circuit
Describe current in a parallel circuit
Current in a parallel circuit always splits at a junction-current that goes into a junction always comes out
Describe p.d. Of all components in a series circuit
Pd always adds up to the voltage of the cell
Describe pd of all components in a parallel circuit
Pd of all components in a LOOP of a parallel circuit adds up to the voltage of the cell
What equation tells me how to work out the charge
Q=IT
CHARGE=CURRENT X TIME
What is ohms law
States that current is directly proportional to voltage , provided that the other physical properties like temp. Remain constant
How do I work out voltage
Voltage = energy / charge
Voltage = current x resistance
V=IR
Describe the relationship between resistance and current
Resistance and current are inversely proportional
R=1
—-
I
What is the units used for voltage
Volts (V)
What units are used for current
Amps (A)
What units are used for resistance
Ohms
Look at symbols for circuits
Look in photos / in bk
What measures curret
Ammeter
