【Daily Question 20090205】Tips on Using Electricity
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To liven up the atmosphere in the area dedicated to technical exchanges on instruments and meters, enhance everyone’s knowledge, and encourage collective learning, we are continuing with the “One Question per Day” activity; participants will receive prizes, with those who answer correctly getting special rewards! Can you answer correctly without looking up information? You cannot copy the content that has already been answered; otherwise it will be invalid! The answer reply is available! 1. When a test pen is used to distinguish between direct current and alternating current, the situation where both poles of the neon tube emit light is __________, while the situation where only one pole of the neon tube emits light is __________. Answer: Alternating current, Direct current. 2. To measure the current in a circuit, the ammeter must be _________ to this circuit; in order to ensure that the connection of the ammeter does not affect the original state of the circuit, the internal impedance of the ammeter itself should be as _________ as possible. Answer: In series, small. A friend on floor 11 has a detailed explanation! This post was last edited by baodingzhai on 2009-2-7 09:06.]
1. When a test pen is used to distinguish between direct current and alternating current, if both poles of the neon tube glow, it is __alternating current__; if only one pole of the neon tube glows, it is __direct current__. 2. To measure the current in a circuit, the ammeter must be connected to this circuit ___in series__. In order to ensure that the insertion of the ammeter does not affect the original state of the circuit, the internal impedance of the ammeter itself should be as ___low___ as possible. This post was last edited by yinghuochong18 on 2009-2-5 13:18.]
Direct current, alternating current in series, small (infinitely close to zero)
1. When a test pen is used to distinguish between direct current and alternating current, if both poles of the neon tube glow, it is direct current; if only one pole of the neon tube glows, it is alternating current. 2. To measure the current in a circuit, an ammeter must be connected in series with that circuit. To ensure that the insertion of the ammeter does not affect the original state of the circuit, the internal impedance of the ammeter itself should be as low as possible.
1. DC, AC. 2 in series, small. :)
1. When a test pen is used to distinguish between direct current and alternating current, if both poles of the neon tube emit light, it is __alternating current__; if only one pole of the neon tube emits light, it is __direct current__. 2. To measure the current in a circuit, the ammeter must be connected to this circuit __in series__. To ensure that the insertion of the ammeter does not affect the original state of the circuit, the internal impedance of the ammeter itself should be as __low__ as possible.
1. Direct current, alternating current 2. Series, small
1. When a test pen is used to distinguish between direct current and alternating current, if both poles of the neon tube glow, it is __direct current________; if only one pole of the neon tube glows, it is ___alternating current_____. 2. To measure the current in a circuit, the ammeter must be connected to this circuit __in series________. In order to ensure that the connection of the ammeter does not affect the original state of the circuit, the internal impedance of the ammeter itself should be as __small__ as possible. This post was last edited by NEWAUTO on 2009-2-5 10:26.]
1. Distinguish between direct current and alternating current. When (alternating current) passes through a test pen, both electrodes inside the neon tube emit light simultaneously ； When (direct current) passes through a test pen, only one of the two electrodes in the neon tube emits light. 2. To measure the current in a circuit, the ammeter must be connected in series with that circuit. To ensure that the connection of the ammeter does not affect the original state of the circuit, the internal impedance of the ammeter itself should be as low as possible.
My answer: 1. When a voltage tester is used to distinguish between direct current and alternating current, if both poles of the neon tube glow, it is __direct current__; if only one pole of the neon tube glows, it is __alternating current__. To measure the current in a circuit, the ammeter must be connected to this circuit ___in series__. To ensure that the insertion of the ammeter does not affect the original state of the circuit, the internal impedance of the ammeter itself should be as ___low___ as possible.
When a voltage tester is used to distinguish between direct current and alternating current, if both poles of the neon tube emit light, it is __alternating current________; if only one pole of the neon tube emits light, it is ___direct current_. Neon lamps inherently have polarity; in alternating current, the positive and negative poles keep changing. Neon lamps flash by lighting up at both ends, at a frequency of 50 hertz. To measure the current in a circuit, an ammeter must be connected to that circuit __in series________. To ensure that the connection of the ammeter does not affect the original state of the circuit, the internal impedance of the ammeter should be as ______low__ as possible. , because the internal resistance of the power supply and the external resistance are in series, the ammeter measures the total current; therefore, the lower the internal resistance, the better.
Answer: Direct current, alternating current； Series, small.
Everyone is good at fill-in-the-blank questions; the four blanks correspond to direct current, alternating current, series connection, and small
1. When a test pen is used to distinguish between direct current and alternating current, if both poles of the neon tube glow, it is direct current; if only one pole of the neon tube glows, it is alternating current. 2. To measure the current in a circuit, an ammeter must be connected in series with that circuit. To ensure that the connection of the ammeter does not affect the original state of the circuit, the internal impedance of the ammeter itself should be as low as possible.
My answer: 1. Alternating current, direct current； 2. In series, as small as possible. :) LZ, this is a middle school physics problem! :L, give me some for 5 years old! :lol Last edited by Feineng on 2009-2-5 11:21 ]
When a test pen is used to distinguish between direct current and alternating current, if both poles of the neon tube glow, it is ____direct current____; if only one pole of the neon tube glows, it is ____alternating current__. 2. To measure the current in a circuit, the ammeter must be connected to this circuit __in series________. In order to ensure that the connection of the ammeter does not affect the original state of the circuit, the internal impedance of the ammeter itself should be as much as possible ___reduced_____.
1. When a test pen is used to distinguish between direct current and alternating current, if both poles of the neon tube glow, it is (alternating current); if only one pole of the neon tube glows, it is (direct current). 2. To measure the current in a circuit, an ammeter must be connected to that circuit in (series). In order to ensure that the connection of the ammeter does not affect the original state of the circuit, the internal impedance of the ammeter should be as (low) as possible.
1. When a test pen is used to distinguish between direct current and alternating current, if both poles of the neon tube glow, it is ___direct current___; if only one pole of the neon tube glows, it is __alternating current__. 3 f- n: [# J; K* I 2. To measure the current in a circuit, the ammeter must be connected to this circuit ___in series__. In order to ensure that the presence of the ammeter does not affect the original state of the circuit, the internal impedance of the ammeter itself should be as ___low___ as possible.
1\Answer: Alternating current, Direct current 2\Answer: Series, small
My answer: 1: Alternating current, Direct current； 2: Series, small ；
1: Alternating current, Direct current 2: Series, Infinitesimally small