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3. Electric Current Electric current is a measure of the amount of electrical charge transferred per unit time. It represents the flow of electron through a conductive material Electric current is similar to a current of water, but electric current flows in solid metal wires so it is not visible. Electric current can carry a lot of power.

4. ELECTRIC CURRENT An ELECTRIC CURRENT exists whenever electric charge flows through a region, e.g., a simple light bulb circuit. The magnitude of the current is measured in AMPERES (Amps/A)

5. Electric Circuits An electric circuit is something that provides a complete path through which electricity travels. Wires in electric circuits are similar in some ways to pipes and hoses that carry water.

6. Electric Circuits

7. Voltage Voltage is the electrical force, or "pressure", that causes current to flow in a circuit. Voltage is measured in volts (V). A voltage difference of 1 volt means 1 amp of current does 1 joule of work in 1 second.

8. Electrical Resistance Resistance measures how difficult it is for current to flow. The total amount of electrical resistance in a circuit determines the amount of current that in the circuit for a given voltage. The more resistance the circuit has, the less current that flows. The SI unit of resistance is the ohm (Ω).

9. Ohm’s Law Georg Simon Ohm (1787-1854), A German physicist, discovered Ohm’s law in 1826. Statement of Ohm's Law The current through a conductor is proportional to the potential difference between its ends, provided the temperature of the conductor remains constant.

10. Ohms Triangle V = I x R (Voltage = Current multiplied by Resistance) R = V / I (Resistance = Voltage divided by Current) I = V / R (Current = Voltage Divided by Resistance)

11. Ohm’s Law: Resistance And Resistors The ratio of voltage to current is called the resistance In many conductors, the resistance is independent of the voltage; this relationship is called Ohm’s law.

12. Electrical Resistor Resistor is used to control the amount of current flowing in a circuit The two main types of resistors : Wire-wound (coil of fine wire) resistors Composition (carbon) resistors Electric resistance is the ratio of one volt and one ampere. Or We can say that Ohm is the unit of Electric resistance. Electrical components called resistors can be used to control current.

13. Ohm’s Law Ohm’s law gives a relationship between the voltage (V), current (I), and resistance (R) as follows: V = I R