Measuring current and voltage

Electric circuit. Voltage. Electric current

You will:

• use schematical drawing of elements of electric circuit to draw electric circuit;
• explain physical meaning of voltage and its unit of measurement;
• explain conditions for production of electric current

8.4.2.2 электр схемасын графикалық бейнелеуде электр тізбегі элементтерінің шартты белгілерін қолдану;

8.4.2.3 кернеудің физикалық мағынасын, оның өлшем бірлігін түсіндіру

Terminology

Electric circuit – электр тізбегі / электрическая цепь

Circuit diagram – тізбектін сұлбасы / схема цепи

Voltage - кернеу / напряжение

Switch – кілт (қосқыш) / выключатель

Bulb/Lamp – шам / лампочка

Cell/Battery – батарея / батарея

Resistor – электр кедергісі / электрическое сопротивление / резистор

Conducting wire – өткізгіш сым / проводник

Electric current - ток күші

Source of electricity – ток көзі

Simple circuit

The closed path through which the electrons flow is called an electric circuit .

https://phet.colorado.edu/sims/html/circuit-construction-kit-dc/latest/circuit-construction-kit-dc_en.html

Some terminology

Measuring electric current

We use ammeter (ampermeter) to measure electric current.

It is connected in series to circuit so that all charge pass through it.

Potential difference: Voltage

Potential difference shows the energy supplied to the charges.

It is very different from current.

Play this to find how voltage and current are related to each other.

https://phet.colorado.edu/sims/html/circuit-construction-kit-dc/latest/circuit-construction-kit-dc_en.html

Experiment time

Now set up a simple circuit with two bulbs as shown in the figures below. Measure the voltage across each bulb and note them in the table.

Discussion: Compare the readings. Are they equal? Why?

https://phet.colorado.edu/sims/html/circuit-construction-kit-dc/latest/circuit-construction-kit-dc_en.html

Home work

Play https://phet.colorado.edu/sims/html/circuit-construction-kit-dc/latest/circuit-construction-kit-dc_en.html