An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?
Answer (2)
In 30 seconds, a device with a current of 15.0 A delivers approximately 2.81 x 10^21 electrons. This is calculated using the relationship between current, charge, and the number of electrons. The total charge delivered is 450 C, which corresponds to this number of electrons.
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Calculate Grace's exchange rate: 242.73 34712 ≈ 143.007 .
Compare the calculated rate to the table.
Identify the matching exchange rate: Saturday at 143.007.
Conclude Grace made the exchange on Saturday: Saturday .
Explanation
Calculate the Exchange Rate First, we need to determine the exchange rate Grace received. This is calculated by dividing the amount of Yen she traded by the amount of Pounds she received.
Calculating the Exchange Rate The exchange rate is calculated as follows: Pound Yen = 242.73 34712 Calculating this gives us an exchange rate of approximately 143.007 Yen per Pound.
Comparing with the Table Now, we compare this calculated exchange rate to the exchange rates provided in the table for each day to find the matching rate.
Identifying the Day Looking at the table, we see that the exchange rate on Saturday was 1:143.007, which matches the exchange rate Grace received.
Conclusion Therefore, Grace made her exchange on Saturday.
Examples
Understanding exchange rates is crucial when traveling or conducting international business. For instance, if you're planning a trip to Japan and want to convert your British Pounds to Japanese Yen, knowing the daily exchange rate helps you determine how much Yen you'll receive for your Pounds. This ensures you get the best possible deal and can manage your travel budget effectively. Similarly, businesses involved in international trade use exchange rates to calculate the cost of goods and services in different currencies, impacting pricing and profitability.
