lIndex":9,"initialQuestionWindow":[{"id":"1783d899-5c48-4ff7-af0c-67a8ce6957a0","revisionId":"066d5877-4ccc-4675-b3e1-a964cd1dfcc5","questionNumber":null,"questionType":"LA","specification":"A student tests a small electric motor designed for a toy car.\n\nWhen connected to a $6.0\\text{ V}$ battery, the current in the motor is $800\\text{ mA}$.","difficulty":5,"difficultyBand":"medium","totalMarks":3,"sourceTitle":null,"calculatorUse":null,"parts":[{"id":"5f3f3677-104c-45a5-9444-2c06fe30da66","label":null,"content":"Calculate the energy transferred to the motor in $5\\text{ minutes}$.\n\nUse an equation selected from the physics equations sheet.","markscheme":"- Converts current to $0.8\\text{ A}$ or time to $300\\text{ s}$ B1\n- Substitutes converted values into $E = V \\times I \\times t$ (e.g. $E = 6.0 \\times 0.8 \\times 300$) M1\n- Calculates a final energy of $1440\\text{ J}$ (or $1.44\\text{ kJ}$) A1","marks":3,"order":0,"markingRubric":null,"explanation":{"methods":[{"id":"electrical_energy","label":"Electrical energy calculation","steps":[{"type":"text","order":1,"title":"Convert the current","content":"The battery provides $6.0\\text{ V}$, the motor current is $800\\text{ mA}$ and the time is $5\\text{ minutes}$. Convert the current to amperes:\n\n$$800\\text{ mA}=0.8\\text{ A}$$\n\nThis conversion earns **B1**. (You could instead convert the time to $300\\text{ s}$.)","highlights":[{"text":"$$800\\text{ mA}$","location":"specification"},{"text":"$$5\\text{ minutes}$","location":"specification"}]},{"type":"hyper_latex","block":{"nodes":[{"latex":"E=V\\times I\\times t"},{"latex":"E=\\htmlData{anchor=voltage-used}{6.0}\\times\\htmlData{anchor=current-used}{0.8}\\times\\htmlData{anchor=time-used}{300}"},{"latex":"E=\\htmlData{anchor=energy-answer}{1440\\ \\mathrm{J}}"}],"highlights":[{"color":"amber","style":"box","anchor":"energy-answer"}]},"order":2,"title":"Substitute into the equation","description":"Use the electrical energy equation from the equation sheet. The time must be in seconds, so 5 minutes is 300 seconds. The substitution line earns M1 for using the converted values; the final line earns A1 for the correct energy."}]}],"generatedAt":"2026-07-22T11:33:19.450Z","modelVersion":"gpt-5.6-terra+diagrams-1","explanationVersion":"v3"},"options":[]}],"options":[],"explanation":null,"firstAttemptFullMarks":null},{"id":"387a16bc-9184-4a05-aebf-14362efd97dd","revisionId":"3230d3dd-f2bc-49fe-9199-331024ce0c39","questionNumber":null,"questionType":"LA","specification":"","difficulty":6,"difficultyBand":"medium","totalMarks":3,"sourceTitle":null,"calculatorUse":null,"parts":[{"id":"a4c2b401-90e7-4dfd-9ce2-c96bd8ad2398","label":null,"content":"An electric passenger ferry docks at a rapid charging pier to replenish its battery bank.\n\nThe pier's charging system provides an average current of 250 A at a potential difference of 800 V.\n\nThe ferry operator claims that 972 MJ of energy can be safely transferred to the onboard battery bank in less than 1.25 hours.\n\nComment on this claim.\n\nUse this equation to support your answer:\n\n$$t = \\frac{E}{I \\times V}$$","markscheme":"- Converts $972 \\text{ MJ}$ to $972,000,000 \\text{ J}$ (or $9.72 \\times 10^8 \\text{ J}$) OR converts $1.25 \\text{ hours}$ to $4500 \\text{ s}$ M1\n- Calculates either the actual time required as $4860 \\text{ s}$ (or $1.35 \\text{ hours}$) OR the maximum energy transferred in $1.25 \\text{ hours}$ as $900,000,000 \\text{ J}$ (or $900 \\text{ MJ}$) A1\n- Correctly compares the calculated value to the claim (e.g. stating that $1.35 \\text{ hours}$ is longer than $1.25 \\text{ hours}$ or that $900 \\text{ MJ}$ is less than $972 \\text{ MJ}$) and concludes that the operator's claim is incorrect A1","marks":3,"order":0,"markingRubric":null,"explanation":{"methods":[{"id":"calculate_transfer_time","label":"Calculate the transfer time","steps":[{"type":"text","order":0,"title":"Choose a single unit","content":"The equation gives time in seconds when ene

Electrical power

Question 3

Electrical power Questions

Electrical power

Question 3

Electrical power Questions