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BRAIN
TEASER

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#1
Why is the letter F
like death?

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#2
During which month do
people sleep the least?

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#3
Which three letters can
frighten a thief away?

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#4
What letter comes next in the
following sequence? D R M F S L T_

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#5
What do an island and the
letter “t” have in common?

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CAPACITANCE
Start Here

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WHAT IS CAPACITATORS?
 An electric component that
temporarily stored charges
within a circuit.

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What is Dielectric?
 A two conducting plates facing
each other and separated by an
insulator.

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Capacitance
 the amount of charges stored in
a capacitator per unit of electric
potential
𝐶 =𝑉
𝑄

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Example:
 Compute the capacitance if the
value of charge stored is 0.3x106
C
and the voltage supplied is 1x103
V
 A battery connected to the plates of
a 3.00 µF capacitator stores a charge
of 27.0 µC. How much voltage is
provided by the battery?

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VARIABLE
EFFECT ON
CAPACITANCE
Area of the
Conducting Plate
Increase Increase
Decrease Decrease
Distance between
the Conducting
Plates
Increase Increase
Decrease Decrease
Type of
Dielectric
More conducting Decrease
Less conducting Increase

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Shape of
Capacitators

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Parallel-plate Capacitators
 the capacitance of parallel-plate
capacitator is directly proportional to
the area of the plates as well as to
the distance between the plates. The
voltage is directly proportional to the
distance between the plates.

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Cylindrical Capacitators
 Inner and outer cylindrical structures
correspond to the plates of the
parallel-plate capacitator.

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Spherical Capacitators
 An internal spherical structure is one
of the charged bodies of the
capacitator.

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Capacitators
in a Circuit
Start Here

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Series Connection
𝑞𝑇𝑜𝑡𝑎𝑙 = 𝑞1 = 𝑞2 = 𝑞3= … = 𝑞𝑛
𝑉𝑇𝑜𝑡𝑎𝑙= 𝑉1 + 𝑉2 + 𝑉3 + … + 𝑉
𝑛
1
𝐶𝑇𝑜𝑡𝑎𝑙
=
1
𝐶1
+
1
𝐶2
+
1
𝐶3
+ … +
1
𝐶𝑛

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Example:
Compute the individual
values and the total values of
the capacitance, charge
and voltage of the circuit.

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Parallel Connection
𝑉𝑇𝑜𝑡𝑎𝑙 = 𝑉1 = 𝑉2 = 𝑉3= … = 𝑉
𝑛
𝑞𝑇𝑜𝑡𝑎𝑙= 𝑞1 + 𝑞2 + 𝑞3 + … + 𝑞𝑛
𝐶𝑇𝑜𝑡𝑎𝑙 = 𝐶1 + 𝐶2 + 𝐶3 + … 𝐶𝑛

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Example:
Compute the individual
values and the total values of
the capacitance, charge
and the voltage of the circuit.