GCSE 2 - Electricity Flashcards
What is the voltage and how is it measured?
Voltage is the energy in the electrons. It is measured in volts using a voltmeter across a device (in parallel)
What is the current and how is it measured?
The current is the flow of electrons. It is measured in amps with an ammeter through a device
What is a series circuit? How does it affect the voltage and current?
A series circuit has all the devices one after another.
The voltage is split across each bulb (to total that of the battery), while the current is the same all the way around the circuit
What is a parallel circuit? How does it affect the voltage and current?
A parallel circuit has several ‘loops’
Each loop has the same total voltage as the battery, while the current is split across each loop.
What is resistance and how do we measure it?
Resistance is the opposition of the flow of electrons in a circuit. It is measured in ohms using an ohmmeter or by using the equation:
Resistance = Voltage/Current
What is Ohms law?
If the temperature is kept constant, the voltage is always directly proportional to the current.
What is power and how is it measured?
Power is how much energy is converted per second. It is measured in Watts.
1 W = 1 j/s
