// Numbas version: finer_feedback_settings
{"name": "Calculate carbon footprint and energy use per unit floor area", "extensions": [], "custom_part_types": [], "resources": [], "navigation": {"allowregen": true, "showfrontpage": false, "preventleave": false, "typeendtoleave": false}, "question_groups": [{"pickingStrategy": "all-ordered", "questions": [{"name": "Calculate carbon footprint and energy use per unit floor area", "tags": [], "metadata": {"description": "<p>The student must calculate the carbon footprint given electricity and gas energy usage.</p>", "licence": "None specified"}, "statement": "<div class=\"textLayer\">\n<p data-start=\"0\" data-end=\"68\">Calculate the carbon footprint and energy use per unit floor area.</p>\n<p data-start=\"70\" data-end=\"78\">Given:</p>\n<ul data-start=\"79\" data-end=\"258\">\n<li data-start=\"79\" data-end=\"134\">Electricity use: <strong data-start=\"98\" data-end=\"119\">{electricity_use}</strong>kWh per year</li>\n<li data-start=\"135\" data-end=\"182\">Natural gas use: <strong data-start=\"154\" data-end=\"167\">{gas_use}</strong>kWh per year</li>\n</ul>\n<p data-start=\"260\" data-end=\"274\">Assumptions:</p>\n<ul data-start=\"275\" data-end=\"436\" data-is-last-node=\"\">\n<li data-start=\"275\" data-end=\"348\">Carbon emissions from gas: <strong data-start=\"304\" data-end=\"331\">{gas_carbon_kg_per_kWh}</strong> kg CO\u2082 per kWh</li>\n<li data-start=\"349\" data-end=\"436\" data-is-last-node=\"\">Carbon emissions from electricity: <strong data-start=\"386\" data-end=\"421\">{electricity_carbon_kg_per_kWh}</strong> kg CO\u2082 per kWh</li>\n</ul>\n</div>", "advice": "<p><strong><span role=\"presentation\" dir=\"ltr\" class=\"textLayer--absolute\">Carbon footprint for electricity</span></strong><br role=\"presentation\" class=\"textLayer--absolute\"/><span role=\"presentation\" dir=\"ltr\" class=\"textLayer--absolute\">&bull;</span><span role=\"presentation\" dir=\"ltr\" class=\"textLayer--absolute\"> </span><span role=\"presentation\" dir=\"ltr\" class=\"textLayer--absolute\">{electricity_use}kWh x {electricity_carbon_kg_per_kWh}kg/kWh = {electricity_use*electricity_carbon_kg_per_kWh}kg</span></p>\n<p><span role=\"presentation\" dir=\"ltr\" class=\"textLayer--absolute\"></span></p>\n<p><span role=\"presentation\" dir=\"ltr\" class=\"textLayer--absolute\"><strong>Carbon footprint for gas</strong><br role=\"presentation\" class=\"textLayer--absolute\"/>&bull; {gas_use}kWh x {gas_carbon_kg_per_kWh}kg/kWh = {gas_use*gas_carbon_kg_per_kWh}kg</span></p>\n<p><span role=\"presentation\" dir=\"ltr\" class=\"textLayer--absolute\"></span></p>\n<p><span role=\"presentation\" dir=\"ltr\" class=\"textLayer--absolute\"><strong>Total carbon footprint</strong><br role=\"presentation\" class=\"textLayer--absolute\"/>&bull; {electricity_use*electricity_carbon_kg_per_kWh}kg + {gas_use*gas_carbon_kg_per_kWh}kg = {(electricity_use*electricity_carbon_kg_per_kWh) + (gas_use*gas_carbon_kg_per_kWh)}kg</span><span role=\"presentation\" dir=\"ltr\" class=\"textLayer--absolute\"></span></p>\n<p><span role=\"presentation\" dir=\"ltr\" class=\"textLayer--absolute\"><br role=\"presentation\" class=\"textLayer--absolute\"/><strong>Elec usage per m<sup>2</sup></strong><br role=\"presentation\" class=\"textLayer--absolute\"/>&bull; {electricity_use}kWh / {floor_area}m<sup>2 </sup>= {precround(dec(electricity_use/floor_area),3)}kWh/m<sup>2</sup></span></p>\n<p><span role=\"presentation\" dir=\"ltr\" class=\"textLayer--absolute\"></span></p>\n<p><span role=\"presentation\" dir=\"ltr\" class=\"textLayer--absolute\"><strong>Gas usage per m<sup>2</sup></strong><br role=\"presentation\" class=\"textLayer--absolute\"/>&bull; {gas_use}kWh / {floor_area}m<sup>2 </sup>= {precround(dec(gas_use/floor_area),3)}kWh/m<sup>2</sup><br/></span></p>", "rulesets": {}, "extensions": [], "builtin_constants": {"e": true, "pi,\u03c0": true, "i": true, "j": false}, "constants": [], "variables": {"electricity_use": {"name": "electricity_use", "group": "Parts a-c group", "definition": "random(50000 .. 200000#1)", "description": "<p>Electricity use in KWh per year.</p>", "templateType": "randrange", "can_override": false}, "gas_use": {"name": "gas_use", "group": "Parts a-c group", "definition": "random(150000 .. 500000#1)", "description": "<div class=\"TextLayer-container\">\n<div class=\"textLayer\"><span role=\"presentation\" dir=\"ltr\" class=\"textLayer--absolute\">Natural gas use in kWh per year</span><br role=\"presentation\" class=\"textLayer--absolute\" /><span role=\"presentation\" dir=\"ltr\" class=\"textLayer--absolute\"></span></div>\n</div>", "templateType": "randrange", "can_override": false}, "gas_carbon_kg_per_kWh": {"name": "gas_carbon_kg_per_kWh", "group": "Parts a-c group", "definition": "random(0.15 .. 0.21#0.001)", "description": "<p>Kilograms of CO2 produced per kWh of energy.&nbsp;</p>", "templateType": "randrange", "can_override": true}, "electricity_carbon_kg_per_kWh": {"name": "electricity_carbon_kg_per_kWh", "group": "Parts a-c group", "definition": "random(0.46 .. 0.2#0.001)", "description": "<p>Kilograms of CO2 produced per kWh of energy.&nbsp;</p>", "templateType": "randrange", "can_override": false}, "total_carbon_footprint": {"name": "total_carbon_footprint", "group": "Parts a-c group", "definition": "(electricity_use * electricity_carbon_kg_per_kwh) + (gas_use * gas_carbon_kg_per_kwh)", "description": "<p>Variable that stores the quantity of CO2 in Kg.&nbsp;</p>", "templateType": "anything", "can_override": false}, "floor_area": {"name": "floor_area", "group": "Parts a-c group", "definition": "random(1000 .. 4000#100)", "description": "<p>Area of floor in metres squared.&nbsp;</p>", "templateType": "randrange", "can_override": false}}, "variablesTest": {"condition": "", "maxRuns": 100}, "ungrouped_variables": [], "variable_groups": [{"name": "Parts a-c group", "variables": ["gas_use", "electricity_carbon_kg_per_kWh", "gas_carbon_kg_per_kWh", "total_carbon_footprint", "electricity_use", "floor_area"]}], "functions": {}, "preamble": {"js": "", "css": ""}, "parts": [{"type": "numberentry", "useCustomName": false, "customName": "", "marks": 1, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "<p>Calculate the total carbon footprint in kgs.&nbsp;</p>", "minValue": "total_carbon_footprint", "maxValue": "total_carbon_footprint", "correctAnswerFraction": false, "allowFractions": false, "mustBeReduced": false, "mustBeReducedPC": 0, "displayAnswer": "", "precisionType": "dp", "precision": 0, "precisionPartialCredit": 0, "precisionMessage": "You have not given your answer to the correct precision.", "strictPrecision": false, "showPrecisionHint": true, "notationStyles": ["plain", "en", "si-en"], "correctAnswerStyle": "plain"}, {"type": "numberentry", "useCustomName": false, "customName": "", "marks": 1, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "<p><span role=\"presentation\" dir=\"ltr\" class=\"textLayer--absolute\">Using the information above, calculate your </span><span role=\"presentation\" dir=\"ltr\" class=\"textLayer--absolute\">energy use per unit floor area for electricity. Floor area &ndash; {floor_area}m<sup>2</sup></span></p>", "minValue": "{electricity_use / floor_area}", "maxValue": "{electricity_use / floor_area}", "correctAnswerFraction": false, "allowFractions": false, "mustBeReduced": false, "mustBeReducedPC": 0, "displayAnswer": "", "precisionType": "dp", "precision": 0, "precisionPartialCredit": 0, "precisionMessage": "You have not given your answer to the correct precision.", "strictPrecision": false, "showPrecisionHint": true, "notationStyles": ["plain", "en", "si-en"], "correctAnswerStyle": "plain"}, {"type": "numberentry", "useCustomName": false, "customName": "", "marks": 1, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "<p><span role=\"presentation\" dir=\"ltr\" class=\"textLayer--absolute\">Using the information above, calculate your </span><span role=\"presentation\" dir=\"ltr\" class=\"textLayer--absolute\">energy use per unit floor area for gas. Floor area &ndash; {floor_area}m<sup>2</sup></span><span role=\"presentation\" dir=\"ltr\" class=\"textLayer--absolute\"><sup></sup></span></p>", "minValue": "{gas_use / floor_area}", "maxValue": "{gas_use / floor_area}", "correctAnswerFraction": false, "allowFractions": false, "mustBeReduced": false, "mustBeReducedPC": 0, "displayAnswer": "", "precisionType": "dp", "precision": 0, "precisionPartialCredit": 0, "precisionMessage": "You have not given your answer to the correct precision.", "strictPrecision": false, "showPrecisionHint": true, "notationStyles": ["plain", "en", "si-en"], "correctAnswerStyle": "plain"}], "partsMode": "all", "maxMarks": 0, "objectives": [], "penalties": [], "objectiveVisibility": "always", "penaltyVisibility": "always", "contributors": [{"name": "Simon Stuttaford", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/26443/"}], "resources": []}]}], "contributors": [{"name": "Simon Stuttaford", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/26443/"}]}