ELECTRIC CURRENT POTENTIAL DIFFERENCE AND RESISTENCE

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ELECTRIC CURRENT POTENTIAL DIFFERENCE AND RESISTENCE

Electric Current

Electric current is the rate of flow of charges  per seconds in a circuit

              
,                    

Q=It

Example

If 16200C coulomb of charges flow in a circuit for 60mins , what is the value of current flow in the circuit ?

Example 2

A current of 2A flows in a circuit for 60 seconds , what is the coulomb of charges flow in the circuit ?

Q=it  = 2 x 60 = 120C

CURRENT IN SERIES AND PARALLEL CIRCUIT

The above Fig 1 shows current in a parallel circuit while fig 2 shows current in a series circuit

In the  series circuit . of fig 2 

In the parallel  circuit of fig 1

The opposite of this is voltage in series and parallel

Voltages in series

Voltages in parallel

POTENTIAL DIFFERENCE

The potential difference is defined as the work done when one coulomb of electricity moves from one point to another

V=W/Q    where w=work done  and  Q = Quantity of Electricity

V=W  (volt)  when Q=1 coulomb

Note , Quantity of Electricity = Quantity of charge flow

Example

If 50 joules of work  is required to move 100 coulomb of charges from one point to another in a circuit, what is the potential difference in the circuit ?

V=w/Q = 50/100  = 0.5V

VOLTAGE IN SERIES AND PARALLEL

Voltage in series is

Voltages in parallel

Example

. ?

V = 10+20+40

V=70V

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