(1 + c)/(r + e + c). The money multiplier (also called the credit multiplier or the deposit multiplier) is a measure of the extent to which the creation of money in the banking system causes the growth in the money supply to exceed growth in the monetary base.
A buzzing light switch could mean the fixture is wearing out, causing an arc of electricity behind the wall plate. If this is the case, the potential for an electrical fire may exist.
A light switch is a device that opens or closes an electrical current to turn on a light fixture, ceiling fan or similar electrical device. Besides lighting up a room, some light switches incorporate special features, like motion detectors, to make moving around in your home safer and more convenient.