Shunt resistance is the simplest, cheapest and most accurate way to measure current. Think of Ohm's law, V = IR. Here, if you put R = 1 ohm, V = I. That is, when 1A of current flows, the voltage across the resistor becomes 1V, so the current can be converted into a voltage immediately.
The second method is to measure AC current. When measuring high voltage current, there is a risk of electric shock. So, when measuring high voltage current, it is measured using a current transformer called CT.
However, CT can only measure AC current. This is improved by using the third Hall sensor and magnetic force.
Both DC and AC current can be measured. However, the price is high and the precision is somewhat inferior.
The shunt resistor is mainly used to measure low voltage and DC current.
CT is used to measure current in a non-contact method in high voltage AC.
Transformer + Hall sensor can measure both DC and AC current and is mainly used for measuring instruments and special purposes.
Answer C
There are roughly three ways to measure current.
Shunt resistance is the simplest, cheapest and most accurate way to measure current. Think of Ohm's law, V = IR. Here, if you put R = 1 ohm, V = I. That is, when 1A of current flows, the voltage across the resistor becomes 1V, so the current can be converted into a voltage immediately.
The second method is to measure AC current. When measuring high voltage current, there is a risk of electric shock. So, when measuring high voltage current, it is measured using a current transformer called CT.
However, CT can only measure AC current. This is improved by using the third Hall sensor and magnetic force.
Both DC and AC current can be measured. However, the price is high and the precision is somewhat inferior.
The shunt resistor is mainly used to measure low voltage and DC current.
CT is used to measure current in a non-contact method in high voltage AC.
Transformer + Hall sensor can measure both DC and AC current and is mainly used for measuring instruments and special purposes.