解析 C。解析:文章中提到“Another common symbol is the light bulb, which is represented by a circle with a cross inside.”,所以灯泡的符号是一个里面有个叉的圆,A 选项里面有个星星不是,B 选项一个里面有波浪的长方形不是,D 选项一个里面有个点的菱形也不是。
A familiar example of this type of current would be a battery. Batteries produce voltage and current in a single direction. If you connect a miniature bulb to a battery, the bulb will generate a uniform amount of light as long as there’s power remaining in the battery, and that is a ...
With things like blood pressure pumps and bag valve masks, the squeeze bulb is used as a pump to force air. Squeeze bulbs can also be used for controlledof gases or fluids, with the user releasing the bulb enough to suck something up. For example, squeeze bulbs are sometimes used to cle...
A bulb socket is a fixture into which a light bulb is inserted and which transmits electric current to the bulb. A bulb socket is connected to some type of electric current, which can come from any number of sources, such as household current or battery power. Most people are familiar ...
An incandescent bulb is a type of light bulb that can work with both alternating and direct current. Although incandescent bulbs...
What type of simple machine is a light bulb?Simple Machines:Simple machines are used to make our work easier. There are six different types of simple machines. These are the wedge, screw, wheel and axle, pulley, lever, and inclined plane. These six features can be combined in innumerable ...
also called an intermediate base. The E17 base is considerably wider and won't fit into a socket made for a candelabra bulb even though the actual bulbs may be of similar height and shape. If you aren't sure of the size of your burned-out bulb and therefore don't know which to buy...
A LiFi bulb is a light bulb used in a rear-projection TV set to project the image onto the screen. The pros and cons of using LiFi...
European light bulb classes define how much energy a bulb uses compared to a standard incandescent bulb with a tungsten filament. Tungsten bulbs produce relatively high amounts of heat, which is essentially wasted energy, as it does not contribute to visible light. Class A bulbs use only 20 to...
What Is an E12 Bulb? What Is an E26 Lightbulb Socket? How to Determine Light Bulb Base Type By comparison, another common small bulb used in some chandeliers and in appliances has an E17 base, also called an intermediate base. The E17 base is considerably wider and won't fit into a soc...