Electric Current.

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Presentation transcript:

Electric Current

Electric current Electric current is the rate of electron flow past a specific point in the circuit (how fast electrons pass through a point in the wire). The symbol for electric current is I. The units of electric current is amperes or amps (A).

Electric current DC

Electric current AC

Electric current can be compared to the flow of water.

Electric current can be compared to water current: Comparison Water Current Electric Current Conductor What is flowing Units for flowing particles Time interval Rate of flow (current) pipe or hose wire water molecules electrons Coulombs (C) of charge (1 C = amount of charge on 6.25x1018 electrons) Litres (L) of water per second (s) per second (s) coulombs per second 1 ampere (A) = 1C/s litres per second

How Electricity Works

How to use an AMMETER AMMETERS are used to measure the ________________ in a circuit. electric current

How to use an AMMETER I1 Example: We want to measure the current at I0 and I1 for the circuit below. I0 I0 the current coming from the power source. I1 the current passing through the bulb. I1

How to use an AMMETER disconnected series To measure the current at I0 or I1, the circuit must be _________________ to make the ammeter part of the circuit. The ammeter is then connected in _____________. disconnected series

How to use an AMMETER positive / red positive / red Connect the terminal of the ammeter to the wire(s) leading to the ___________________terminal of the power source. positive / red positive / red

How to use an AMMETER negative / black negative / black Connect the terminal of the ammeter to the wire(s) leading to the ___________________terminal of the power source. negative / black negative / black

How to use an AMMETER I1 To measure I0 :

How to use an AMMETER I1 To measure I1 :

How to Read an AMMETER

How to Read an AMMETER What is the reading on this ammeter? If you connected the circuit to the 3A setting on the ammeter, then the current reading is 1.5 A. If you connected the circuit to the 1A setting on the ammeter, then the current reading is 0.5 A.

How to Read an AMMETER What is the reading on this ammeter? If you connected the circuit to the 3A setting on the ammeter, then the current reading is 2.15 A. If you connected the circuit to the 1A setting on the ammeter, then the current reading is 0.72 A.

How to Read an AMMETER What is the reading on this ammeter? If you connected the circuit to the 300 mA setting on the ammeter, then the current reading is 215 mA.

Electric Shock