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Current and Potential Difference Continued. Today: we revise the rule for electric current We learn the rule for potential difference. Current.

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current and potential difference continued

Current and Potential Difference Continued

Today: we revise the rule for electric current

We learn the rule for potential difference

slide2

Current

In an electric c____, currentis the flow of e_______. The bigger the current, the m___ electrons are flowing around the circuit. The w___ carry the electrons from one terminal around the circuit to the other t______.

ircuit

ore

lectrons

ires

erminal

lamps

measuring current i
Measuring current I

In a series circuit the current is the same wherever you measure it.

When measuring current ammeters are always placed in series.

Set up the circuit shown below……

…and then record the current using an ammeter in the places shown below.

The current is the same for each ammeter.

What do you notice about the readings?

A

A

A

slide4

Voltage

oltage

The v_____ is a measure of how big a push the e_______ are given as they leave the cell or b_____. The bigger the voltage, the bigger the p___.

The cell, battery or p____ s_____ produces the voltage.

lectrons

attery

ush

ower upply

lamps

measuring voltage i
Measuring voltage I

For a series circuit, the sum of the voltages for each component is equal to the voltage across the cell or battery.

V1 = V2 + V3

Set up the apparatus as shown……

…then record the voltages at the locations shown.

What do you notice about the readings?

V1

1.5

NB Voltmeters are connected in parallel

0.75

0.75

V2

V3