What is an ammeter in a battery circuit used for?
What is an ammeter in a battery circuit used for?
An ammeter is a measuring device used to measure the electric current in a circuit. A voltmeter is connected in parallel with a device to measure its voltage, while an ammeter is connected in series with a device to measure its current.
What is a battery resistor?
A battery is a real-life voltage source. A battery can be thought of as a perfect voltage source with a small resistor (called internal resistance) in series. The terminal voltage equals the emf minus the voltage drop across the internal resistance (current of the external circuit times the internal resistance.)
Does the ammeter go before or after the resistor?
You can connect it after the resistor or before the resistor ,the value in the ammeter will be same because the resistor wont affect the current flow in a series condition. So you can connect the ammeter in any way.
Does resistor drain battery?
If the resistor value is high the current will be lower therefore draining the battery slower. But at the same time a high value resistor will have a high voltage drop. As the battery voltage drops this voltage drop across the resistor will prohibit the LED from emitting light before the battery is empty.
Do resistors use up current?
The resistor “consumes” power (not current) and that power is the product of voltage across the resistor times the current flowing. The current flow is determined from the equation I = V/R.
Do resistors generate power?
Power in Resistors. When a current flows through a resistor, electrical energy is converted into HEAT energy. The heat generated in the components of a circuit, all of which possess at least some resistance, is dissipated into the air around the components.
What causes resistors to fail?
A fixed composition resistor normally fails in an open configuration when overheated or overly stressed due to shock or vibration. Excessive humidity may cause an increase in resistance. A variable composition resistor may wear after extensive use, and worn away particles may cause high resistance short circuits.
What happens when a resistor is open?
Open Circuits. Current will only flow IN A CIRCUIT. Any interruption in the circuit, such as an open switch, a break in the wiring, or a component such as a resistor that has changed its resistance to an extremely high value will cause current to cease.
Can current exist without voltage?
Voltage attempts to make a current flow, and current will flow if the circuit is complete. It is possible to have voltage without current, but current cannot flow without voltage.
What is the highest voltage possible?
one million volts