Physics paper 1 Questions & 100% Correct Answers | Latest Update | Graded A+

step-up transformer (first transformer in a national grid diagram) : a transformer that increases voltage step-down transformer (second transformer in a national grid diagram) : a transformer that decreases voltage transformer : A device that increases or decreases the voltage of alternating current transformer : decreases current Power=(current)^2*resistance : P=I^2*R Resistance equation : Voltage/current 2 | P a g e Efficiency equation : Efficiency= Useful energy output/total energy input -Measured in % specific heat capacity practical method : 1-Place the immersion heater into the central hole at the top of the block. 2-Place the thermometer into the smaller hole and put a couple of drops of oil into the hole to make sure the thermometer is surrounded by hot material. 3-Fully insulate the block by wrapping it loosely with cotton wool. 4-Record the temperature of the block. 5-Connect the heater to the power supply and turn it off after ten minutes. 6-After ten minutes the temperature will still rise even though the heater has been turned off and then it will begin to cool. Record the highest temperature that it reaches and calculate the temperature rise during the experiment. energy transferred equation : Power x time Change in thermal energy equation : Mass x specific heat capacity x t