Given below is the electric circuit. Obseng this carefully and answer the
guestions given below:
P.
122
392
A
| 1-11-113
SYAHRI
st,
9 V
1. What would be the reading of ammeter?
2. What is the total equivalent resistance of the circuit?
3. What would be the reading of a voltmeter connected
between the points Q and R?
4. what would be the reading of the ammeter if only the
highest of the three resistors were present alone in the circuit?
5. what would be the reading of a voltmeter connected between
Cthe points P and S?
Answers
Answer:
1) V=IR, here V is the potential difference across a resistance R through which a current I is flowing. The ammeter is connected in series with the circuit. So its reading will show the value of the current flowing in the circuit. Hence, the reading of the ammeter is equal to 1A.
2) The equivalent resistance of a 4-Ω and 12-Ω resistor placed in parallel can be determined using the usual formula for equivalent resistance of parallel branches: 1 / Req = 1 / R1 + 1 / R2 + 1 / R3 ... Now the Ohm's law equation (ΔV = I • R) can be used to determine the total current in the circuit.
3) An ammeter is a measuring device used to measure the electric current in a circuit. A voltmeter is connected in parallel with a device to measure its voltage, while an ammeter is connected in series with a device to measure its current.