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Circuit basics
Jul 05, 2016


Rivers was able to flow, because of falling water; the charge was able to flow, because the potential difference. Potential difference or voltage. Voltage is the cause of electric current. In the circuit, voltage u said. Voltage is measured in volts (v), millivolts (mV) or micro-Volts (uV) units. 1V=1000mV,1mV=1000uV。

Voltage can be measured with a voltmeter. When measuring, in parallel with the voltmeter circuit, voltage meter pointer close to full deflection range you want to select. If the voltage on the circuit size estimate does not come out, first with a large range, roughly measured with an appropriate range. This will prevent damage due to excessive voltage voltmeter.

Current electricity

Directional mobile call charge circuit, current common I said. DC and AC current in two ways. The magnitude and direction of the currents do not change with time, called DC. The magnitude and direction of the current changes over time is called Exchange. The unit of electric current is (a), MA (mA) or microamp (uA) units. 1A=1000mA,1mA=1000uA。

Current can be measured with a meter. When measuring, the ammeter in series circuits, ammeter pointer close to full deflection of the range you want to select. This prevents overcurrent damage meter.


For current in a circuit by hinder and cause energy consumption is called resistance. Resistance r said. The unit of resistance is Europe (ω), kilohm (kΩ) or megohms (MΩ) units. 1kΩ=1000Ω,1MΩ=1000000Ω。 The resistance of a conductor by the conductor material, the cross-sectional area and length.

Resistance can be measured with a multimeter to Ohm. When measured, close to deflect the meter pointer to select half of the ohm. If the resistance in the circuit, to seal off one end of the resistor and measure again.