3B Scientific Advanced Electricity and Magnetism Kit - Manual (Page 2)

SEK Electricity/Electric Current
Work sheet
1
E105 Electric current in circuits with no branches
Exercise
x
Investigate current at various points in an electric circuit with no branches.
Equipment
From SEK Electricity and Magnetism (U8506000)
1 Resistor, 33 :
1 Resistor, 47
:
1 Switch
Experiment leads
Additionally required
1 SEK base plate (U8408035)
1 SEK power supply (U8498030)
1 ESCOLA 2 multimeter (U8531171)
Set-up and procedure
1) Assemble a circuit as shown in Fig. 1a.
2) Set the rotary switch on the power supply to 6
V.
3) Set the ammeter to 3000 mA.
4) Have the circuit checked before you turn it on.
5) Turn on the power supply.
6) Close the switch and switch the ammeter back
step by step to the best measuring range I
1
. En-
ter your measurement into the table.
7) Measure the current values I
2
and I
3
by inserting
the ammeter at different points of the circuit,
according to the sketches in Fig. 1b and Fig. 1c.
Enter those values into the table.
8) Set the rotary switch of the power supply to 3 V
and repeat the whole experiment, entering the
results into the table.
9) Once the experiment is complete, turn the
power supply off.
a)
+
–
6 V
R
1
R
2
A
I
1
0 1
AC
DC
+
-
1,5 V
3 V
4,5 V
6 V
3000 3000
1000 100
10
1
mA = mA ~
V ~ V =
10 3
1
0,3
10 3
1
0,3
1000 100
10
1
+
–
6 V
A
I
2
R
1
R
2
0 1
AC
DC
+
-
1,5 V
3 V
4,5 V
6 V
b)
3000 3000
1000
100 10
1
mA = mA ~
V ~ V =
10
3
1
0,3
10
3
1
0,3
1000
100 10
1
+
–
6 V
A
I
3
R
1
R
2
0 1
AC
DC
+
-
1,5 V
3 V
4,5 V
6 V
c)
3000 3000
1000
100 10
1
mA = mA ~
V ~ V =
10
3 1
0,3
10
3 1
0,3
1000
100 10
1
30 30
30 30
30 30
Fig. 1