Write the range of the ammeter used in experiment.
Answers
There's a standard way of doing this: put a resistor in parallel with the ammeter.
There's a standard way of doing this: put a resistor in parallel with the ammeter.All real ammeters have a series resistance. Ideally this is a very low value, but in practice is usually a few ohms, so that, for example, an ammeter with a range of 1 mA and a resistance of 10 ohms would have 10 mV drop across the ammeter itself.
There's a standard way of doing this: put a resistor in parallel with the ammeter.All real ammeters have a series resistance. Ideally this is a very low value, but in practice is usually a few ohms, so that, for example, an ammeter with a range of 1 mA and a resistance of 10 ohms would have 10 mV drop across the ammeter itself.If you wanted to increase the range of this ammeter so that its maximum range was 10 mA, you would put a resistor in parallel with the ammeter, of such a value that 90% of the current flowed around the ammeter through the new resistor, and only 10% of the current flowed through the ammeter itself.
There's a standard way of doing this: put a resistor in parallel with the ammeter.All real ammeters have a series resistance. Ideally this is a very low value, but in practice is usually a few ohms, so that, for example, an ammeter with a range of 1 mA and a resistance of 10 ohms would have 10 mV drop across the ammeter itself.If you wanted to increase the range of this ammeter so that its maximum range was 10 mA, you would put a resistor in parallel with the ammeter, of such a value that 90% of the current flowed around the ammeter through the new resistor, and only 10% of the current flowed through the ammeter itself.In this way, when 10 mA was flowing into your new meter, only 1 mA would actually flow through the original ammeter, and this is within the range of the ammeter. All you have to do is take the reading on the ammeter and multiply by ten to get the actual current in the circuit.
There's a standard way of doing this: put a resistor in parallel with the ammeter.All real ammeters have a series resistance. Ideally this is a very low value, but in practice is usually a few ohms, so that, for example, an ammeter with a range of 1 mA and a resistance of 10 ohms would have 10 mV drop across the ammeter itself.If you wanted to increase the range of this ammeter so that its maximum range was 10 mA, you would put a resistor in parallel with the ammeter, of such a value that 90% of the current flowed around the ammeter through the new resistor, and only 10% of the current flowed through the ammeter itself.In this way, when 10 mA was flowing into your new meter, only 1 mA would actually flow through the original ammeter, and this is within the range of the ammeter. All you have to do is take the reading on the ammeter and multiply by ten to get the actual current in the circuit.To calculate the resistor in this case, just note that when 10 mV is dropped across the meter, 9 mA must be flowing through the new resistor (leaving the other 1 mA to flow through the original meter). So the resistor you need is 10 mV / 9 mA = 1.111... ohms.
There's a standard way of doing this: put a resistor in parallel with the ammeter.All real ammeters have a series resistance. Ideally this is a very low value, but in practice is usually a few ohms, so that, for example, an ammeter with a range of 1 mA and a resistance of 10 ohms would have 10 mV drop across the ammeter itself.If you wanted to increase the range of this ammeter so that its maximum range was 10 mA, you would put a resistor in parallel with the ammeter, of such a value that 90% of the current flowed around the ammeter through the new resistor, and only 10% of the current flowed through the ammeter itself.In this way, when 10 mA was flowing into your new meter, only 1 mA would actually flow through the original ammeter, and this is within the range of the ammeter. All you have to do is take the reading on the ammeter and multiply by ten to get the actual current in the circuit.To calculate the resistor in this case, just note that when 10 mV is dropped across the meter, 9 mA must be flowing through the new resistor (leaving the other 1 mA to flow through the original meter). So the resistor you need is 10 mV / 9 mA = 1.111... ohms.Switching these resistors in parallel with the original meter is what happens when an ammeter changes range.
Explanation:
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