I. What is electric current?
The flow of charges/electrical energy through a solid material (metals)
A. Components wires, switches, motors that are connected to provide a path through which electricity travels.
B. Switches turn circuits on and off
C. Circuit diagram (schematic)
1. Wire straight line
D. Resistors any electrical component that uses energy.
E. Open circuit When a switch is in the off position; breaks prevent current
F. Closed circuit When a switch is in on position; current flows
A. Kinds positive and negative
B. Electrostatic forces forces between positive and negative charges; because most objects are neutral, they hold many objects together.
C. Protons and Electrons electrons stay within the atom because they are attracted to the protons in the nucleus.
A. Battery is chemical energy used to move charge particles through a wire
B. Volts measure the energy level at a certain place in a circuit.
1. A 1.5 volt battery adds 1.5 joules of energy that leaves the positive end of a battery.
2. When a battery dies there is not enough energy to push the charges through the circuit.
C. Measuring Voltage negative terminal assigned 0 V, all other places on the circuit relative to this value. All points on a wire are the same voltage.
D. Usage When energy (chemical from battery) is used, voltage drops
V. Current is a flow of electric charges.
A. Flow from high voltage to low voltage (plus to minus)
B. Charges already present in the wire; battery repels electrons in the wire, which
repel other electrons in the wire, etc.
C. Voltage vs. Current voltage supplies energy to make charges flow; current carries energy.
D. Ampere unit for the measurement of current
E. Circuit breaker prevents the current from becoming damaged if too much current is received.
F. Alternating current direction of current in the circuit goes back and forth (as in your home).
G. Direct current battery only makes current flow in one direction.
A. conductor allows current to pass through it easily
B. insulator prevents the passage of electric current
C. Resistance a measure of how easily charges flow through an object.
1. Units ohm (W) is the unit of resistance
2. Ohms Law the current in a circuit is directly proportional to the voltage and inversely proportional to the resistance.
3. Current = Voltage/Resistance or I = V/R
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|Last update: Thursday, January 31, 2013|