Blog

Home > Blog (Page 5)

A radio is an electrical device that receives an invisible signal, or radio wave, from a radio station and converts the signal into sound that we hear and understand. A radio wave is a type of electromagnetic radiation that can be used to convey audio information. Radio waves have energy associated with them. Using a transmitter and an antenna, radio stations transmit waves like the ones in Figure 1, which shows both a...

Materials and Equipment Advanced Bristlebots Robotics Kit, available from  us. You will need the following materials from the kit: Mini breadboard 2xAAA battery holder AAA batteries (2) Mini vibration motors (2) Toggle switch Mini solar cells (2) 1 inch red jumper wire 1 inch black jumper wire You will also need the following materials, not included in the kit: Identical toothbrushes (2); be sure the longest bristles on the brush...

While testing out the kite designs kids will learn about how lift and air pressure work together to make things fly! Kites have been constructed and flown for thousands of years. They have been used for fun, for military exercises, and for scientific purposes. You may know that Benjamin Franklin used a kite to show that lightning is electricity. There is also historical evidence that in China kites were used more...

Motors that use direct current (DC) voltage are found in many familiar items, such as electric shavers, battery-powered drills, and the fans in laptop computers. DC voltage does not alternate with time. For example, a 9-volt (V) battery has a constant voltage difference between its positive and negative terminals of 9 V. A graph of the voltage at the positive terminal vs. time would be a straight line at 9 V. Alternating current, on the other...