ELECTRICITY
I can state the requirements for a
functioning electrical circuit
What is electricity?
• It is the movement of charged atomic particles called “electrons”
Conventional current
Electrical
charge
e-
e-
e-
e-
ee-
e-
e-
There needs to be an electric
potential difference between the
two ends of a circuit  supplied
by an electrochemical cell
Volts (V)
Measure of the force moving the electrons around
in a circuit
Current
• It is the movement of charged atomic particles called “electrons”
• Measured in amperes (A)
e-
e-
e-
e-
e-
e-
e-
Requirements of a circuit
1. Energy supply  to establish an _______________ across the two
ends of the circuit
2. Closed, conducting loop that stretches from the high potential,
positive terminal to the low potential, negative terminal
3. Bulb
Summary
• A battery/ electrochemical cell provides the supply of energy that
makes it possible for an electric potential difference
• A battery is NOT the supply of charge (i.e. you technically do not
“charge” a battery)
• When there is a break in a circuit, current does not flow