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Current Electricity Electric Current • is a measure of the number of electrons that move through a circuit • the symbol for electric current is (I) • the unit to measure electric current is the ampere, the symbol for the ampere is (A) • the instrument that is used to measure the electric current in a circuit is called an ammeter. Electric Potential • is a measure of the amount of energy the electrons possess • the symbol for electric potential is (V) • the unit to measure electric potential is the volt, the symbol for the volt is (V) • the instrument that is used to measure the electric potential in a circuit is called a voltmeter Electrical Resistance • an object in an electrical circuit that impedes the flow of electrons by using their electrical energy. • the symbol for electrical resistance is (R) • the unit to measure electrical resistance is called the ohm (). Ohm’s Law • The voltage drop between two points on a conductor is proportional to the electric current flowing through a conductor • The equation for this relationship is: • V=IxR • Where: • V represents the voltage (measured in volts) • I represents the current (measured in amps) • R represents the resistance (measured in ohms) Ohm’s Triangle • • • • I (Current) Amp (a) R (Resistance) (Ω) V (Potential Difference) Volt (v) 5 Step Approach to Solving Problems • Step 1: write down the information given in the questions • Step 2: write down the required item • Step 3: write down the equation • Step 4: substitute the known values into the equation and calculate the answer • Step 5: write a sentence with the answer Example: Calculate the amount of current (I) in a circuit, given values of voltage (V) and resistance (R):