Download series circuits

What we will do today:
•
Carry out experiments to investigate the
following relationships:
1. Current in a series circuit
2. Voltage in a series circuit
Current in a series circuit
(don’t copy)
• What is a series circuit?
• What apparatus would be required to
measure the current at different
points in a series circuit?
Current in a series circuit
Point on circuit
Value of Current (A)
Is (supply current)
I1
I2
• In a series circuit, the current is the
same at all points.
• Is = I 1 = I 2 …
Voltage in a series circuit
(don’t copy)
• What apparatus would be required to
measure the voltage at different
points in a series circuit?
Voltage in a series circuit
Point on circuit
Value of Voltage (V)
Vs (supply voltage)
V1
V2
• In a series circuit, the sum of all the
voltages is the same as the supply.
• Vs = V1 + V2 …
What have we learned today?
• In a series circuit, the current is the
same at all points.
• Is = I1 = I2…
• In a series circuit, the sum of all the
voltages is the same as the supply.
• V s = V1 + V2…
Example 1 – find the missing
values below
• Is = I1 = I2 = 0.6A
• Vs = V1 + V2
=2+2
Vs = 4V
Example 2 – find the missing
values below
• Is = I1 = I2 = 0.6A
• Vs = V1 + V2
=2+2
Vs = 4V
2003: 24(b)
• (i) Vs = V1 + V2 … so 10 lamps get equal share
of Vs. So 230 / 10 = 23 V
• (ii) If one lamp breaks / goes out then all
lamps go out.