Current is the flow of electric charge through a circuit measured in amps. In a series circuit, the current is the same through all components, while in parallel the current splits across branches. Voltage is the potential difference of electric charge between two points and is measured in volts. In series circuits, voltage drops across components, while in parallel circuits all components have the same voltage. Voltage causes current to flow; voltage can exist without current but current cannot flow without an applied voltage.

1. CURRENT
AND
VOLTAGE

2. Current

3. Is the rate at which electric
charge flows past a point in a
circuit. In other words, current
is the rate of flow of electric
charge.
The symbol for current is I and
the unit is a/amps/amperage. 1
ampere is equal to 1 second.

4. In series connection, current
is the same through all
components connected in a
series
In parallel connection, current
gets distributed over
components connected in
parallel.

5. Voltage

6. Also called electromotive force,
is the potential difference in
charge between two points in
an electrical field. In other
words, voltage is the energy per
unit charge.
The symbol for voltage is V and
the unit is v/volts/voltage.

7. In series connection, voltage
gets distributed over
components connected in
series.
In parallel connection, voltages
are the same across all
components connected in
parallel.

8. The Relationship
of Current and
Voltage:

9. 
Voltage is the cause and
current is the effect. Voltage
can exist without current but
current cannot flow without
voltage.