It is helpful to try and figure out ahead of time how ideas and inventions will affect other people. Science and technology have improved transportation, health, sanitation, and communication. The benefits of science and technology are not available to all people. NSES Content Topic Light, heat, electricity, and magnetism Electricity in circuits can produce light, heat, sound, and magnetic effects. Electrical circuits require a complete loop through which the electrical current can pass.
Magnets attract and repel each other and certain kinds of metals.
NSES Content Topic Light, heat, electricity, and magnetism Light travels in a straight line unless it strikes an object Light can be reflected by a mirror, refracted by a lens, or absorbed by the object. Heat can be produced in many ways such as burning, rubbing, and mixing chemicals. The heat can move from one object to another by conduction. Vibrating objects produce sound. The pitch of the sound can be varied by changing the rate of vibration.