16.2 Current and Voltage. Electric Current (review from yesterday) Electric current: the flow of electric charge (movement of electrons)

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+ V (Volt) = W (work done, J) Q (charge, C)

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Presentation transcript:

16.2 Current and Voltage

Electric Current (review from yesterday) Electric current: the flow of electric charge (movement of electrons)

Current Conservation of Energy: amount of current entering circuit = amount of current exiting Electric current carries energy in a circuit. Current is measured in amperes (A)

Measuring Current To measure current you must force the current through a multimeter multimeter A multimeter can measure alternating current (AC) or direct current (DC) - use DC with batteries and light bulbs

Voltage Voltage: a measure of electric potential energy A difference in voltage provides the energy that causes current to flow. Voltage is measured in volts (V) 1 volt = 1 amp of current does 1 J of work in 1 second

Measuring Voltage To measure voltage touch a multimeter’s probes to two places in a circuit or across a battery.

Batteries A battery uses stored chemical energy to create the voltage difference.

Batteries What is the total voltage in this flashlight?