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22
SECTION 1
11
Complete the following statements choosing the right alternatives.
1
When two resistances are connected in series
.................................................................................................................................
a
they must both have the same resistance value
b
the voltage across each must be the same
c
they must have different resistance values
d
there is only one path for current through both resistances.
2
With two resistances connected in parallel
.........................................................................................................................................
a
the current through each must be the same
b
the voltage across each must be the same
c
their combined resistance equals the sum of the individual values
d
each must have the same resistance value.
3
If a parallel circuit is open in the main power line, the current
..................................................................................................
a
increases in each branch
b
is zero in all the branches
c
is zero only in the branch that has highest resistance
d
increases in the branch that has lowest resistance.
4
This text is describing a circuit in
.............................................................................................................................................................
a
Europe
b
the USA
c
the UK
d
Italy.
12
Use the information from this lesson to do the following tasks.
a
State two rules for voltage and current values in a parallel circuit.
b
Explain briefly why the current is the same in both sides of the main line that connects the voltage source
to the parallel branches.
c
State three rules for current, voltage and resistance in a series circuit.
Old and new electric meters.
Progetto FOR ELECTRONICS_unit_1.indd 22
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