CP9 Electricity initial definitions Flashcards
Draw the circuit symbol for a cell including representing the positive and negative terminals
A long line with a + and a short line with a -
What is the difference between a series and parallel circuit?
A series circuit only has one loop a parallel circuit has more that one loop
What is eletrical current?
The rate of flow of charge
What is the charged particle that can flow through metals?
electron
What is the unit for current?
Amp, A
What is the unit for charge?
Coulomb, C
Explain how you would measure current through a bulb
Place an ammeter in series with the bulb
(next to bulb)
Explain how you would measure the potential difference across a bulb
Place a voltmeter in parallel with the bulb
Voltmeter is on a separate piece of wire - connected each side of bulb
What happens to current at a junction in a circuit?
The total current in equals the total current out
What is the potential difference across each branch of a parallel circuit?
Potential difference is the same across every branch of a parallel circuit
What is the rule for potential difference in a series circuit?
p.d. of battery = p.d. of component 1 + p.d. of component 2 +…
(The p.d. of the components adds up to the p.d. of the power supply)
What is potential difference measured in?
volt, V
Define a volt in words
joule per coulomb J/C
Define potential difference in words
the energy transferred per unit charge passed
