2c Energy and Voltage in Circuits Flashcards
What is current?
The rate of flow of charge
What is current measured in?
Current is measured in amperes (amps) which have symbol A
What can you conclude about the current in a series circuit?
The current in a series circuit is always the same at all positions no matter where you measure from
What can you conclude about the current in parallel branches?
- Current splits at junctions and adds up at junctions to give the total current
- Total current into a junction = total current out
What is the equation for charge?
Charge = Currant x Time
Q = IxE
What is charge, current and time measured in?
Charge - Coulomb - C
Current - Amps - A
Time - Seconds - S
What is voltage?
Voltage is energy transferred per unit charge
What happens when there is a higher voltage of battery?
So the higher the voltage of a battery, the more energy it gives to the electrons, the higher the voltage across a bulb, the more energy it takes from electrons
What do we measure voltage by?
We measure voltage using a voltmeter, connected is parallel
The units of voltage are Volts
What conclusion can you make about the voltage is series circuits
The sum of voltage across each component adds up to the voltage in the battery
What conclusion can you make about the voltage in parallel circuits?
The voltage in the bulbs is similar/same to the voltage in the battery
What is the current and voltage in series circuits?
Current is the same at all points in a series circuit but splits at junctions in parallel circuits
What is current and voltage in parallel circuits?
Voltage is split across components in series but is the same across parallel branches
What is resistance?
- Resistance is the opposition that an electrical device has to the flow of electrical current.
- The higher the resistance the lower the current
What is the equation for resistance?
Resistance = voltage/current
What is resistance measured in?
Ohms
