explain how to measure the voltage and current in a simple circuit?

Question

electricity question

Answer 1

The commonest way to measure voltage is to place a circuit of known and, preferrably, precision components, in parallel to the voltage and watch the deflection of a meter needle against a calibrated scale. One calls such a device a voltmeter.

The two commonest ways to measure current are to place a transformer in the magnetic field of the current in question and measure the current generated in the instrument by deflection against a calibrated scale and by placing a meter into the circuit (in series) and simply measuring the current flowing against the traditional calibrated scale. The latter is used mostly in circuits that one will monitor from a panel while the former is more for circuits that exist and cannot easily be modified. For instance, a motor circuit on a ship being monitored from a central electrical panel for a meter (amp meter) installed in the circuit vs. a handheld ammeter for a household circuit.

Answer 2

Assuming that a simple circuit means a resistive circuit with a power source ...

Voltage: using a voltmeter, touch each probe to each side of the resistor. This means the voltmeter is in parallel with the resistance.

Current: put an ammeter in series with the resistance. Each probe has to be on the same side of the resistor. There is an internal resistance that could affect your reading, but that internal resistance is large to minimize this effect.

From a practical standpoint, you could use the equations below to calculate voltage or current, depending on what values are known ...

Ohm's Law:
V = IR,

where the voltage is equal to the product of the current and resistance. So if you have a known supply voltage and resistance, you can calculate the current by solving the above equation for I:

I = V/R.

Answer 3

You never use an ammeter in a simple circuit, it's not practical. A simple circuit with some resistors has a voltage supply. Voltage is dropped across each component and current flows through each component. In a series circuit, the voltage dropped across each component adds up to the supply voltage and the current is equal through each component. In series, calculate the resistance by adding all resitor values then use Ohm's Law. E = RI to calculate total current, where E is the supply voltage, I is current and R is total resitance.
E/R = I
Then to calculate voltage drop across each resistor, use Ohms law again V = RI, multiply resistance value of each resistor by current or use a voltmeter.

Answer 4

Voltage is measured in parallell, usually from ground to a particular point in the circuit. It is measured with a volt meter.
Current is measured by inserting an ammeter in series at a particular point in the circuit.

Answer 5

Voltage is measured using a Voltmeter connected 'In Parallel' (across the circuit).
Current (amperes), is measured using an 'Ammeter' (amp-meter) 'In Series' with the circuit, (along the circuit).

Answer 6

we a simple role for voltage and current :
voltage = curren*resistance
resistance is a resistant that a device or cord apear against electricite.
if you like to know more, send email to me.

Answer 7

Voltmeter and ampmeter

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If you didn't like my answer, then stop asking vague questions. Specific questions get more specific answers.