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# Chapter 13, 14

### Revise Current Electricity

What is an electric current? A electric current it the flow of electricity.
What unit is current measured in? Ampere (Amps).
What is the symbol for current? A.
What instrument measures current? Ammeter.
What is potential difference or voltage? Voltage or potential is the electric energy charge difference of electric potential energy transported between two points.
What unit is voltage measured in? Volts.
What is the symbol for voltage? V.
What instrument measures voltage? Voltmeter.
What is resistance? Resistance is the opposition to the passage of electrical current.
What unit is resistance measured in? Ohms.
What is the symbol for resistance? Ω (Ohm/Greek letter Omega)
What instrument measures resistance? Ohmmeter.
What is the function of the following components in a circuit? Battery, switch, resistor, voltmeter, ammeter. Battery: Supplies the electricity. Switch: Turns the circuit on and off. Resistor: Limits the flow of current in the circuit. Voltmeter: Measures the voltage in the circuit. Ammeter: Measures the amps in a circuit.
What is Ohm’s law? The current through two point is directly proportional to the voltage difference across the two points.
What is the formula for Ohm’s Law? Current (I) is equal to Voltage (V) over Resistance (R), I=V/R
What is meant by a series circuit? When all the parts of the circuit are connected end to end as a single electrical path.
Explain what happens if one bulb in the series circuit blows. All the other bulbs stop lighting.
What is meant by a parallel circuit? When all the parts of the circuit are connect to each other but through multiple paths.
Explain what happens if one bulb in the parallel circuit blows. The other continue to work as the electricity can still flow around the circuit.
What is direct current? Current that flows only in one direction.
What is alternating current? Current that switches direction rapidly.
What is the voltage of the mains supply? 220-240V (230V).
What is the unit of electricity? Kilo Watt hour KWh.
An electrical kettle has a power rating of 2kW, and is used to boil water for three hours every day. What is the cost of running the kettle for a week? 42kWh.
Explain the role of the fuse both in a plug and a circuit breaker. The fuse is a safety mechanism. It stops high current electricity spikes by burning itself out if the current gets too high.
Created by: SC Dave