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Current Electricity
by ER XUE HUI
# Current Electricity

## Electromotive Force (emf)

### SI Unit :

### Definition :

### Formula :

### Measured with :

### Has the same unit as
potential difference(p.d.)

## Potential Difference(p.d.)

### Definition:the amount of energy when
one coulomb of positive charge passes
between the two points

### V=W/Q

### SI Unit: volt(V)

### Measure with a voltmeter
parallel to the component of the
circuit

## Resistance

### definition:the ratio of potential difference
across the conductor and the current
flowing in it.

### formula:R=V/I (units:ohm)

### masurement

### fixed resistors &viable
resistor(rheostat)

## Current

### Caused by :

### Electron flow opposite to
conventional current flow

### Electron flow :

### Measured with :

### Formula :

### Definition :

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V (Volts)

E = W/Q

Voltmeter connected parallel to source

In series: R=R1+R2

In parallel: 1/R=1/R1+1/R2

flow of electrons around a complete circuit

moves from negative terminal of source to positive terminal

Ammeter

I = Q/t

Rate of flow of charges