What is the power dissipated by the 2 ohm resistor?
1. 8 W 2
What is the power dissipated by the 4 ohm resistor?
Hence, the power dissipated in the resistor R1 (4 ohms) = 4W.
What is the power dissipated by the resistor?
The power dissipated by each resistor can be found using any of the equations relating power to current, voltage, and resistance, since all three are known. Let us use P=V2R P = V 2 R , since each resistor gets full voltage.
What is the relationship of the 4 ohm and 2 ohm resistors?
Answer. 4 ohm and 2 ohm resistors are connected in series. In series circuit, the current flows the same in all resistors but the potential difference is different so that is why we are taking the total resistance to total potential difference.
What is the combination of a 2 ohm resistor?
What is the current in the 5.0 ohm resistor?
Ammeter A in the circuit reads 0.50 ampere. A 5.0-ohm resistor, a 10.0-ohm resistor, and a 15.0-ohm resistor are connected in parallel with a battery. The current through the 5.0-ohm resistor is 2.4 amperes.
What is the current in the 10 resistor?
What is the current through the 30 ohm resistor?
At which position should an ammeter be placed?
How is an ammeter connected to a circuit?
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 does an ammeter measure?
Ammeter, instrument for measuring either direct or alternating electric current, in amperes. An ammeter can measure a wide range of current values because at high values only a small portion of the current is directed through the meter mechanism; a shunt in parallel with the meter carries the major portion.
Do ammeters have resistance?
Just like voltmeters, ammeters tend to influence the amount of current in the circuits they’re connected to. However, unlike the ideal voltmeter, the ideal ammeter has zero internal resistance, so as to drop as little voltage as possible as current flows through it.
What is the resistance of ammeter?
The internal resistance of an ideal ammeter will be zero since it should allow current to pass through it. The ammeter is connected in series in a circuit to measure the current flow through the circuit.
Why is the resistance of an ammeter is kept very low?
The reason for ammeter resistance to be low is because it can accurately read the current flowing in the circuit. When the ammeter resistance is low, almost all the current in the circuit is allowed to pass through the ammeter. This is because, in this case, the ammeter itself would oppose the flow of current.
Should the resistance of an ammeter be high or low give reasons?
The resistance of an ammeter should be low. An ammeter has to be connected in series with the circuit to measure current. In case, its resistance is not very low, its inclusion in the circuit will reduce the current to be measured. In fact, an ideal ammeter is one which has zero resistance.
Why does a voltmeter has high resistance?
A voltmeter measures the voltage difference between the two different points (say, on different sides of a resistor), but it should not change the amount of current going through the element between these two points. So it should have very high resistance so mat it doesn’t draw current through it.
Why does a voltmeter have infinite resistance?
A voltmeter is used to measure the potential difference across the two points of a circuit. For it, the voltmeter is connected in parallel across those two point. The potential difference measured by voltmeter will be accurate if no current is drawn by voltmeter. Thus, ideal voltmeter has infinite resistance.
What happens if a voltmeter is not ideal?
A not ideal voltmeter does influence the circuit it is measuring because it draws it (small) current from the circuit. This current influences the circuit, (mostly always) resulting in a lower measured on the testpoint when the voltmeter is connected, that without the voltmeter connected.
What would happen if the resistance of the voltmeter were not ideal?
REVIEW: An ideal voltmeter has infinite resistance. Too low of an internal resistance in a voltmeter will adversely affect the circuit being measured.
Does ammeter have infinite resistance?
Consequently an ideal voltmeter will have infinite resistance. An ammeter is connected in series with the circuit to be measured. The ideal ammeter will have zero resistance so as not to disturb the circuit. The little that remains will flow through the ammeter.