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)
