Electricty Flashcards
What does the ammeter do?
Measures the electric current
What are amps?
Units of measurement of electric current with the symbol A.
What is the current?
The flow of electrical charge (electrons) around a complete circuit per second.
What do ohms represent?
Resistance with the symbol Ω.
What is potential difference?
Potential difference (volts) is the energy transferred over the charge.
What is resistance?
Resistance is how difficult it is for current to flow through a component.
What does a voltmeter do?
Measures volts/potential difference
What is the circuit symbol for an LED?
Circle, triangle with vertical line, line goes through it and arrows coming out of it.
What does LDR stand for?
Light Dependent Resistor
What equation links charge, current and time?
charge = current x time
Current, potential difference and resistance can be linked using what equation?
potential difference = current x resistance
What component has an extremely high resistance in the reverse direction?
The diode
True or false, for components connected in series, is the current the same through each component?
True
What is the missing word? For components connected in series the total …… of two or more components is the sum of the ……. of each component.
Resistance
For components connected in parallel is the potential difference across each component the same or different?
The same
What is the missing word? For components connected in parallel the total …… through the whole circuit is the sum of the …… through the separate branches.
Current
What are the missing words? For components connected in parallel the total resistance of two or more resistors is …… ….. the resistance of the smallest individual resistor
Less than
