Tagged: physics

characteristics of a thermistor

A thermistor is an electronic component whose resistance changes with temperature. The voltage and current of a thermistor can be measured as the temperature changes. Sensors allow you to take the many readings necessary...

magnetic field in a coil

You can ‘see’ magnetic fields using iron filings. You can measure the strength of magnetic fields using a magnetic field sensor connected to a computer. How, for example, does that field vary as you...

current-voltage relationships

In this experiment the resistance of a lamp, resistor or diode is measured as the current is varied. Voltage and current sensors make the measurements while the software plots the results in real-time. After...

capacitor discharge

The voltage and current in a circuit change when a capacitor charges and discharges. Computer sensors can measure these changes and software can plot a graph as fast as this happens. Also, the effect...

types of battery 2

Batteries or electrical cells are made using different substances. There are zinc dry-cells, alkaline cells and lead-acid accumulators. When you use them, the chemicals become exhausted at different rates. So choosing the right battery...

types of battery

Batteries are a handy source of power. You’ll know that there are different kinds of batteries, and maybe that some are good for some jobs, and some for others. But battery power is expensive. It...

pendulum & simple harmonic motion

A position sensor can be used to study this. The sensor is attached to a weight and spring assembly as shown. This can also be used to study the effects of changing the mass...

pressure & temperature

The pressure in a sealed container changes with temperature. These changes can be monitored using sensors attached to the computer. A graph of pressure against temperature can be plotted as the changes occur. After...

radioactive half-life

Radioactive materials decay, or lose their radioactivity, in a predictable way. If you have a fast decaying source, such as Protactinium with a half life of just 72 seconds, you can take a series...

heat conduction through a window

Get two temperature sensors to measure the temperature inside and outside a window. You may find that over a long period of time it is best to record your data remotely. This means that...

heat conduction

You can use a temperature sensor to study the conduction of heat through materials. Two temperature sensors allow you to compare different materials at the same time. In this example, you heat strips of...