Work backwards: use your calculated value for time and the current given in the question to calculate the quantity of charge and compare this value to that given in the question: Substitute in the values and solve for t:.Question: Calculate the time in minutes required to produce 12,000 C of charge (electricity) using a current of 10 amps. Take the test now! Worked Example: Calculating Time State your solution to the problem "calculate current":.Since the time calculated here is the same as that given in the question, we are confident that our calculated value for the current is correct. Work backwards: Use the value for the current calculated above and the quantity of charge (electricity) given in the question to calculate the time taken, and compare this to the time given in the question:Ĭonvert time in seconds to time in minutes by dividing by 60 Substitute in the values and solve for I:.Question: Calculate the current needed to provide 30,000 coulombs of charge (electricity) in 5 minutes. Play the game now! Worked Example: Calculating Current State your solution to the problem "calculate quantity of charge":. Since the time calculated here agrees with that given in the question we are reasonably confident that our answer for Q is correct. Work backwards: Use your calculated value for Q and the current given in the question to calculate time, then compare this to the time given in the question: Substitute the values into the equation and solve for Q:.What is the relationship between what you know and what you need to find out?.What data (information) have you been given in the question?Ĭonvert time in minutes to time in seconds by multiplying by 60.(Based on the StoPGoPS approach to problem solving.) Question: Calculate the quantity of charge (electricity), Q, obtained when a current of 25 amps runs for 1 minute. No ads = no money for us = no free stuff for you! Worked Example: Calculating Quantity of Charge (iii) electrolysis of aqueous solutions to extract an element:Įxample from industry: electrowinning of copper (ii) electrolysis of molten salts to extract a metalĮxample from industry: extraction of aluminium from bauxiteĮxample from industry: extraction of sodium from molten soduim chloride This equation can be used to determine the quantity of charge, electric current, or length of time required to run an electrolysis experiment such as:Įxample from industry: electrorefining of copper.This equation can be rearranged to calculate the time taken given the quantity of charge (electricity) and the electric current:.This equation can be rearranged to calculate the electric current given quantity of charge (electricity) and time:.Q = quantity of charge (electricity) in coulombs (C) The quantity of charge (or electricity) contained in a current running for a specified time can be calculated:.The amount of charge is given the symbol Q and is measured in units of coulombs (C). The amount of charge passing a point in an electric circuit depends on the electric current and the time the current is allowed to flow for.This flow of electrons is called an electric current.Ĭurrent is given the symbol I and is measured in units of amperes (amps, A). A galvanic cell (voltaic cell) produces a flow of electrons.You need to become an AUS-e-TUTE Member! Q = I × t : Quantity of Charge (Electricity) Calculations Chemistry Tutorial Key Concepts Want chemistry games, drills, tests and more? Quantity of Electricity Chemistry Tutorial More Free Tutorials Become a Member Members Log‐in Contact Us
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