Which best describes an electric current? An electric current is a flow of electric charge in a circuit. More specifically, the electric current is the rate of charge flow past a given point in an electric circuit. The charge can be negatively charged electrons or positive charge carriers including protons, positive ions or holes. Which […]
Why is electromagnet preferred over permanent magnet?
Why is electromagnet preferred over permanent magnet? The main advantage of an electromagnet over a permanent magnet is that the magnetic field can be quickly changed by controlling the amount of electric current in the winding. However, unlike a permanent magnet that needs no power, an electromagnet requires a continuous supply of current to maintain […]
What is the 10 uses of concave mirror?
What is the 10 uses of concave mirror? Concave mirrors are commonly used in torches, searchlights and headlights of vehicles to get powerful parallel beams of light. They are used as shaving mirrors to see a larger image of the face. Dentists use concave mirrors to view large images of the teeth of the patients. […]
What is the initial direction?
What is the initial direction? The initial direction of a saccade was defined as the angle between its starting point and eye position when the saccade had covered a distance of 2.5 deg. The effective direction was defined as the angle between the positions of the eye at saccade onset and offset. What is direction […]
What are the disadvantages of fossil fuel energy?
What are the disadvantages of fossil fuel energy? What are the main disadvantages of fossil fuels? Fossil fuels pollute the environment. Fossil fuels are non-renewable and unsustainable. Drilling for fossil fuels is a dangerous process. What are the positive effects of fossil fuels? Why is fossil fuel good? Easier to store and transport. Fossil fuels […]
How can you tell if gas is carbon dioxide?
How can you tell if gas is carbon dioxide? The most effective way to test for CO2 is to bubble the gas through “limewater”, a diluted solution of calcium hydroxide (slaked lime). When you bubble carbon dioxide through the solution, it forms a solid precipitate of calcium carbonate – chalk or limestone. Calcium carbonate is […]
What three things can happen to light when it hits an object?
What three things can happen to light when it hits an object? The Sun casts its longest shadow when it first appears and before it disappears. When light waves hit substances, three things can happen: Light can be refracted, absorbed, or reflected. Reflection occurs when light strikes a surface and bounces off. What 4 things […]
What is the mass in grams of 6.64 mol W?
How can you tell if an object is virtual or real?
How do you fix a vibrating speaker?
How do you fix a vibrating speaker? 9 Simple Fixes to Stop Car Speakers and Doors From Rattling Remove Items from the Pockets in the Door Panels. Locate the Speaker Creating the Problem. Inspect the Speaker Mounting for Loose Screws. Determine Whether the Rattling Comes from a Blown Speaker. Use a Car Speaker Enhancement Kit […]