Current And Voltage Flashcards
Electrical currents can be represented by ……. Diagrams?
Circuit
What two things are important for a circuit to work?
- there must be a complete circuit
- there must be no short circuits
What is a series circuit?
Componants ar connected one after another in a loop. The current that flows across each componant is the same.
If two lamps are connected in series and one breaks, will the other lamp light?
No
What is a parallel circuit?
Componants are connected on seperate loops in parallel. The current is shared between each componant.
In a parallel circuit, if one lamp breaks, will the other lamp still work?
Yes
What is electric current?
A flow of electric charge.
What is current measured in?
Amperes (amps/A)
How is current through a circuit measured?
Through an ameter.
A potential difference, also known as ……, across an electrical componant is needed to make a …… Flow through it.
Voltage
Current
….. And batteries often provide the potential difference needed.
Cells
What is potential difference measured in?
Volts (V)
What measures the potential difference across a componant?
A voltmeter
How must a voltmeter be connected?
In parallel with the circuit.
What is charge measured in?
Coulombs (C)
A typical cell produces a potential difference of 1.5V. If there was 2 cells, what would the potential difference be?
3V because the total potential difference is the sum of their potential differences.
When more cells are connected in series in a circuit, they produce a bigger potential difference across its componants. More current flows through the componants as a result. What will happen to the reading on the ammeter?
It will increase.
When two or more componants are connected in series, the …. Current flows through each componant.
Same
In a series circuit, the total potential difference of the supply is shared between the componants. This means if you add together the voltages across each componant connected in series, the total …… The voltage of the …. Supply.
Equals, power
