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Topic 3 Assignment
Vocabulary:
Resistance - the degree to which a substance or device opposes the passage of an
electric current, causing energy dissipation. Ohm's law resistance (measured in ohms) is
equal to the voltage divided by the current. A resistor or other circuit component that
opposes the passage of an electric current.
Ohm - the SI unit of electrical resistance, expressing the resistance in a circuit
transmitting a current of one ampere when subjected to a potential difference of one
volt.
Ohmmeter - an instrument for measuring electrical resistance.
Ohm’s law - Electrical resistance is calculated by finding the ratio of the voltage across
the load (V) to the current through the load (I). This is called Ohm’s Law.
Resistor - a device having a designed resistance to the passage of an electric current.
Variable resistor (rheostat) - To change electron flow gradually, a variable resistor, or
rheostat is used. Example: a dimmer switch, volume control knob
Series circuit - A circuit in which there is only one pathway for the current to flow. The
same current passes through all the components.
Parallel circuit - A circuit in which the current can flow in two or more paths. (Ex. Like
the streets in a city).
Assignment:
Complete the Topic 3 Review questions #1-8 p. 291.
1. Something resisting the current, like a tube getting squished
2. R=V/I
3. R=V/I
R=Resistance (ohms)
V=Voltage (volts)
I=Current (amps)
4. A series circuit is a circuit all connected/A parallel circuit has many different ways
a current can pass through
5. Core, paper Insulation, rubber insulator
6. Parallel, because there is only one resistor on each way
7. R=V/I
V=RI
V=32*6.8
V=217.6 v
8. Angela, as Resistance increases Current Decreases