The current flowing through a small flashlight bulb is about 0.25A, which is equal to how many ma? The maximum power supply current of a semiconductor radio battery can reach 120mA, which is equal to how many a?

The current flowing through a small flashlight bulb is about 0.25A, which is equal to how many ma? The maximum power supply current of a semiconductor radio battery can reach 120mA, which is equal to how many a?

250mA、0.12A

The electricity flowing through the small light bulb of the flashlight is about 0.25A, which is equal to how many ma? The electricity reaching 120mA is equal to how many a? Thank you for your help

250 Ma

The light bulb of a miniature flashlight is made into the shape shown in the figure, and its front end is equivalent to a light bulb______ Using this kind of light bulb can save a part of the general flashlight, it is______ ．

The light parallel to the main optical axis converges at a point after being refracted by the convex lens. This point is the focus of the convex lens. According to the reversibility of the light path, the filament is placed on the focus of the convex lens and will be emitted in parallel after being refracted by the convex lens The filament should be in the focus of concave reflector bowl