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There is a current in a resistor for a time . The potential difference (p.d.) across the resistor is . A student calculates the product . In which unit is the student’s answer measured?
ampere
coulomb
joule
watt
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in a resistor for a time 
. The potential difference (p.d.) across the resistor is 
. A student calculates the product 
. In which unit is the student’s answer measured?
