## How do you connect an ammeter in a circuit to measure the electric current through a resistor?

Ammeters. Resistors in series have the same current flowing through them. An ammeter, must be placed in series with a resistor to measure the current through the resistor. On a circuit diagram, an ammeter is shown as an A in a circle.

## Where do you place an ammeter in a circuit?

An ammeter is placed in series in the branch of the circuit being measured, so that its resistance adds to that branch. Normally, the ammeter’s resistance is very small compared with the resistances of the devices in the circuit, and so the extra resistance is negligible.

## How do you set up an ammeter in a circuit?

The most common way to measure current in a circuit is to break the circuit open and insert an “ammeter” in series (in-line) with the circuit so that all electrons flowing through the circuit also have to go through the meter.

## What does a resistor do in a circuit?

A resistor is an electrical component that restricts the flow of electric current. A graph of current against potential difference shows you how the current flowing through a component varies with the potential difference across it.

## What happens if there is no resistor in a circuit?

a) If there is no resistor in the circuit ( as in , if you completely remove the resistor) , then there will be no current flowing in the circuit. However, there will be a voltage at the 2 terminal points where the removed resistor used to be.

## What happens when a resistor is in parallel with a wire?

Thus, if a resistor is in parallel with a wire, there is zero volts across the resistor. If there is zero current through the resistor, the resistor can be removed without affecting the circuit. Thus, a resistor in parallel with a wire is equivalent to a wire by itself.

## How do I determine the wattage of a resistor?

Step 7: Determine Needed Wattage for Resistor The physical size of the resistor is directly related to how much wattage it can accomodate. The larger the resistor the more wattage, or the more power it can dissipate. The amount of heat dissipated per unit time is measured in watts.

## How much power does a diode dissipate?

So the watts in the “Power dissipation” is actually current * voltage. Yes, but remember it’s just the voltage across the diode which, for silicon diodes, will be about 0.7 V. So at 1 A you will have P=VI=0.7×1=0.7 W dissipated in the diode.