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topic 2 eletricity4frv - Coggle Diagram
topic 2 eletricity4frv
Using a Multimeter to Measure Current
•Current is the rate of flow of electrical charges in a closed circuit. Symbol for current is I.
•The unit of current is ampere and its symbol is A.
•Another unit of current is milliampere and its symbol is mA. The milliampere can be its symbol is mA. The milliampere can be
•An ammeter can be used to measure the current passing through an electrical component in a circuit. Ammeters are connected in series to the components.
•A multimeter can also be used to measure current. A multimeter is connected in series to measure current
Using a Multimeter to Measure Voltage•Voltage provides the energy needed for current to pass through a closed circuit. Symbol for voltage is V.
•The unit of voltage is volt and its symbol is V.
•Another unit of voltage is millivolt and itssymbol is mV. The millivolt can be used as aunit for smaller values of voltage.
•A voltmeter can be used to measure the voltage across an electrical component in a circuit.A voltmeter is connected in parallel
Voltage and Power Ratings
•Power is commonly expressed in the unit of watt with the symbol W. Another unit of power is the kilowatt with the symbol kW, where 1 kW = 1000 W.
•Electrical appliances convert electrical energy into different forms of energy that we need. Different electrical ratings
Calculating Electrical Power
•Electrical power can be calculated using the relationship:P = IV where P = Power in watt (W)I = Current in ampere (A) V = Voltage in volt (V)
power = current x voltage
Circuit Symbols Used in Circuit Diagrams
