2. describes the relationship between current, voltage, and resistance greater the voltage across a device with resistance, the greater the current through the device 1. Ohm’s Law

3. current = voltage (volts) (amps) resistance (ohms) I = V R 10 amps cause wires to get hot 22 amps are maximum for a house circuit 25 or higher can start a fire 1. Ohm’s Law continued

4. You have a wire with a resistance of 5 ohms and a potential difference of 75 volts. What is the current? R = 5 ohmsV = 75 volts I = VI = 75 volts R 5 ohms I = 15 amps 2. Using Ohm’s Law

5. voltage = current x resistance V = I x R resistance = voltage current R = V I 3. Rearranging Ohm’s Law

6. A circuit has 3 resistors connected to a battery. A current of 1.0 A flows through the circuit. The resistance if 25 Ω. What is the voltage of the battery? V= IRI= 1.0 AR= 25Ω V= 1.0 A x 25Ω= 25 volts 4. Calculating Voltage

7. measure of the stored electric charge per unit electric potential measured in units called farad capacitors store electrical energy 5. capacitance

8. one where electrons have only one path along which they can move current flows from one load to next in a single path, but if one load goes out, circuit is open and won’t work ex. christmas tree lights 6. series circuit

9. one where the electrons have more than one path to move along if load gets out, it will still work because electrons have another path to travel 7. parallel circuit