If a 4.0ω resistor, a 6.0ω resistor, and an 8.0ω resistor are connected in parallel across a 12 volt battery, what is the total current of the circuit? 6.7 amps 18 amps 1.8 amps 3.6 amps

Acoal-fired plant generates 600 mw of electric power. the plant uses 4.8 x 10^6 kg of coal each day, and the heat of combustion of coal is 3.3x 10^7 j/kg. the steam that drives the turbines is at a temperature of 300° c, and the exhaust water is at 37° c. (a) what is the overall efficiency of the plant for generating electric power? (b) how much thermal energy is exhausted each day? (c) what is the change in entropy of the universe for this heat engine? (d) using the same heat reservoirs, what is the maximum possible (carnot) efficiency for a heat engine?

Which is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?

What is the equation for electrical work?