Transcript Current, Voltage and Resistance

Open up your notes at page 5, note 11. Resistance
Work in pairs - Attempt to fill in the blank spaces in note
11.
resistance
R
Ohms
W
20 W
decreases
3
6
higher
lower
Problems on page 8
10/04/2016
Aim
Method
Voltage, Current and Resistance
To discover the relationship between
current, voltage and resistance
For various resistors, measure the
resistance …
W
… then put the resistor into the following
circuit to measure its voltage and current.
+
-
12V d.c.
V
A
Results
Resistance Voltage
(V)
(W)
Current
(A)
Voltage
Current
Conclusion
Resistance
Resistance is a measure of the opposition to the flow of
current.
ohmmeter is used to measure resistance.
An __________
Voltage divided by current is equal to the value of resistance.
Nat 4 only
Now draw a graph of Voltage along the X axis and Current on the
Y axis…..then you can work in pairs and use the ipad to work through
Nat 4 BBC Bitesize
Open up your notes at page 9, note 18. Ohm’s Law
Work in pairs - Attempt to fill in the blank spaces in note
18.
voltage
current
voltmeter
directly
current
20
20
20
resistance
V
I
R
increases
V
A
W
R =?
V = 12 V
I = 8 mA
= 0.008 A
Problems on page 14 and 15.
R= V
I
= 12
0.008
= 1500 W