Electric Circuits

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Transcript Electric Circuits

Chapter 20.3
 Key
• What is included in a circuit diagram?
• How do series and parallel circuits differ?
• How do you calculate electric power and electrical energy used?
 Vocabulary:
• Electric circuit
• Series circuit
• Parallel circuit
• Electric power
symbols to represent
parts of a circuit.
• Sources of electrical
• Devices that are run by
electrical energy
Each battery = 1.5V
has only ONE path through
which it can flow.
one element stops functioning in
a series circuit, NONE of the
elements can operate.
• The bulbs in a circuit are a source of
resistance. The more bulbs, the more
 Voltage
is split
equally among the
resistors in the
 Current
is the same
throughout the
 What
would the voltage
be at each bulb if the
total voltage is 9 V.
 How
could you make
each bulb brighter
has TWO OR MORE paths
through which the charge can flow.
one element stops functioning, the
rest of the elements can still
is the rate of doing
• Power is measured in WATTS
power is the rate at
which electrical energy is
converted to another form of
Electrical power is calculated by
multiplying voltage by current.
P (watts) = I (amps) x V (volts)
power is calculated by
multiplying voltage by current.
Power (P) = Current (I) x Voltage (V)
 An
electrical oven is connected to a 240volt line, and it uses 34 amps of current.
What is the power used by the oven?
P = I xV
P = 34A x 240 V
P = 8200 W
Math Practice
• Page 611
Problems 1 – 3
• Page 613
Problem 7 - 8
much energy is used by
an appliance.
• Energy = Power x Time
• Unit = kilowatt-hours