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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