You will need
  • Ammeter
According to Ohm's law for electric circuits of a direct current:U=IR, where:U - the value supplied to the electric circuit,
R - impedance of an electric circuit,
I - the value flowing through the electric circuit to determine the amperage you divide the voltage applied to the circuit at its full resistance. I=U/RСоответственно, in order to increase the amperage, you can increase input circuit voltage or decrease the resistance.The amperage will increase if you increase the voltage. Increasing the current will increase in proportion to the voltage. For example, if the circuit a resistance of 10 Ω was connected to the standard battery voltage of 1.5 Volts, the current through it the current was:
A 1.5/10=0.15 A (Amperes). When connected to this circuit even with one power supply At 1.5 V the total voltage will be 3 V, and flowing in an electrical circuit current will increase to 0.3 A.
The connection is made sequentially , that is, plus a single battery is attached to the minus of the other. Thus, by connecting sequentially a sufficient number of power sources, it is possible to obtain the required voltage and provide the current flow needed power. United in one chain, several sources of stress are referred to as battery elements. In everyday life, such design is commonly referred to as "batteries (even if the power source consists of only one element).In practice, however, the increase of amperage may differ slightly from the estimated (proportional increase in voltage). This is mainly due to additional heating of the conductors of the circuit, occurring when increasing the passing current on them. However, as a rule, there is an increase in resistance which reduces the current.In addition, increasing the load on the electric circuit can lead to "burnout or even fire. Especially need to be careful at operation of household devices that can operate only at a fixed voltage.
If you reduce the impedance of the electric circuit, the amperage will also increase. According to Ohm's law the current strength increase will be proportional to the decrease in resistance. For example, if the supply voltage was 1.5 V, and the resistance was 10 Ω, then the chain passed electric current value of 0.15 A. If the resistance of the circuit to reduce in two times (to make equal 5 Ohms), then passing through the circuit, the current will increase twice and will amount to 0.3 amperes.An extreme case of reducing the resistance of the load is a short circuit where the load resistance is practically zero. Infinite current at the same time, of course, does not occur because the circuit has an internal resistance of the power source. More significant drag reduction can be achieved, if strongly cooled conductor. This effect of superconductivity based obtaining currents of great power.
To improve the AC current used various electronic devices, mainly transformers are used, for example, welding. AC power also increases with decreasing frequency (as a result of the surface effect decreases the resistance of the circuit).If an AC circuit contains active resistance, the amperage will increase with increasing capacitance and reducing inductance coils (solenoids). If the chains are only tanks (capacitors), the current will increase with increasing frequency. If the circuit consists of inductors, the current will increase with decreasing frequency of the current.