Current and Ohms law
Why can’t you use lightning to power electrical devices? Lightning releases large amount of electricity. Devices need CURRENT to flow.
What is electric current? Continuous flow of electrons through a material Defined as the Amount of charge that passes through a wire in an amount of time Current is measured in amps More amps means more electricity flowing There are more charges (electrons) flowing in the wire
Does electric current automatically exist in a material? NO WAY!!! What does it need? A specific and completed path to flow or follow
To produce electric current… Charges must flow from one place to another Charges must flow from one place to another through a circuit A circuit has a power source(voltage), a pathway(conductor), and a load(resistance.) wire Electrons travel from the _____________ end of the battery all the way back around to the ___________ side of the battery.
Closed versus Open Closed path is working. no breaks in the pathway Open path does not work. Open places in the pathway Electrons travel from the Negative end of the battery all the way back around to the Positive side of the battery.
Can you build a simple circuit to light a bulb? Energy Source(voltage) Makes charges move around or flow in a circuit Resistor/Load Transforms electrical energy into something (like light
What happens if we add another bulb? Series Circuit- All parts are connected in a single loop. A series circuit provides only one path for charges to flow. Adding another load increases the resistance in the current. So the flow decreases, the current has decreased/dropped so the bulbs are not as bright. Ohms law states that as resistance increases and voltage stays the same, then the current will decrease.
What happens if we add another battery? Adding another battery increases the voltage in the current. So the flow increases, the current has increased so the bulbs are brighter. Ohms law states that as voltage increases and resistance stays the same, then the total current will increase. 3 volts