Physics BMAT Revision Questions and Answers

Equation involving voltage, energy and charge voltage (V) = energy (J) / charge (C) Equation involving current, charge current (A) = charge (C) / time (s) Equation involving voltage, current and resistance Voltage (V) = current (A) x resistance (Ω) Equation involving power, energy and time power (W) = energy (J) / time (s) Equation involving power, current and voltage power (W) = current (A) x voltage (V) Equation involving energy, current, time and voltage energy (W) = current (A) x time (s) x voltage (V) What is charge? the flow of electrons. It is given the symbol (Q) and is measured in coulombs What is current? the rate of flow of charge. It is measured in amps (A) What is voltage? potential difference. The amount of energy that electrons have when going around different parts of the circuits. It is measured in volts (V) What is resistance? a measure of how difficult it is for an electric current to pass through a component. Measured in ohms (Ω) What is power? the amount of energy being used per coulomb of charge. It is measured in watts (W). It is given the symbol (P) What is heat? a measure of the thermal energy contained in an object, which is the sum of the kinetic energy of all the particles comprising it. Its measured in joules and cannot be below 0 How does the boiling point of water change when you add salt? the boiling point will increase. The boiling point of any liquid is affected by impurities being present in it