356163
A choke coil has negligible resistance. The alternating potential drop across it is \(220\,volts\) and the current is \(5\,mA.\) The power consumed is
1 \(220 \times \frac{5}{{1000}}\;W\)
2 \(\frac{{220}}{5}\;W\)
3 Zero
4 \(2.20 \times 5\;W\)
Explanation:
Phase angle \(=\dfrac{\pi}{2}\) (between \(V\) and \(I\) ) \(\Rightarrow \cos \phi=0\) \(\Rightarrow \cos \phi=0\) \(\Rightarrow\langle P\rangle=0\) Since \(\langle P\rangle=V I \cos \phi\) Average power is zero. So, correct option is (3).
PHXII07:ALTERNATING CURRENT
356164
An electric heater rated \(225V\) and \(550W\) is connected to \(AC\) mains. The current drawn by it is:
1 \(0.8\,A\)
2 \(2.0\,A\)
3 \(0.4\,A\)
4 \(1.25\,A\)
Explanation:
\(\because P = VI \Rightarrow I = \frac{P}{V} = \frac{{550}}{{225}} = 2.0A\)
PHXII07:ALTERNATING CURRENT
356165
A 100 \(W\)/200 \(V\) bulb and an inductor are connected in series to a \(220V/50Hz\) supply. Find the power consumed by the bulb. \((L = 1H)\)
356163
A choke coil has negligible resistance. The alternating potential drop across it is \(220\,volts\) and the current is \(5\,mA.\) The power consumed is
1 \(220 \times \frac{5}{{1000}}\;W\)
2 \(\frac{{220}}{5}\;W\)
3 Zero
4 \(2.20 \times 5\;W\)
Explanation:
Phase angle \(=\dfrac{\pi}{2}\) (between \(V\) and \(I\) ) \(\Rightarrow \cos \phi=0\) \(\Rightarrow \cos \phi=0\) \(\Rightarrow\langle P\rangle=0\) Since \(\langle P\rangle=V I \cos \phi\) Average power is zero. So, correct option is (3).
PHXII07:ALTERNATING CURRENT
356164
An electric heater rated \(225V\) and \(550W\) is connected to \(AC\) mains. The current drawn by it is:
1 \(0.8\,A\)
2 \(2.0\,A\)
3 \(0.4\,A\)
4 \(1.25\,A\)
Explanation:
\(\because P = VI \Rightarrow I = \frac{P}{V} = \frac{{550}}{{225}} = 2.0A\)
PHXII07:ALTERNATING CURRENT
356165
A 100 \(W\)/200 \(V\) bulb and an inductor are connected in series to a \(220V/50Hz\) supply. Find the power consumed by the bulb. \((L = 1H)\)
356163
A choke coil has negligible resistance. The alternating potential drop across it is \(220\,volts\) and the current is \(5\,mA.\) The power consumed is
1 \(220 \times \frac{5}{{1000}}\;W\)
2 \(\frac{{220}}{5}\;W\)
3 Zero
4 \(2.20 \times 5\;W\)
Explanation:
Phase angle \(=\dfrac{\pi}{2}\) (between \(V\) and \(I\) ) \(\Rightarrow \cos \phi=0\) \(\Rightarrow \cos \phi=0\) \(\Rightarrow\langle P\rangle=0\) Since \(\langle P\rangle=V I \cos \phi\) Average power is zero. So, correct option is (3).
PHXII07:ALTERNATING CURRENT
356164
An electric heater rated \(225V\) and \(550W\) is connected to \(AC\) mains. The current drawn by it is:
1 \(0.8\,A\)
2 \(2.0\,A\)
3 \(0.4\,A\)
4 \(1.25\,A\)
Explanation:
\(\because P = VI \Rightarrow I = \frac{P}{V} = \frac{{550}}{{225}} = 2.0A\)
PHXII07:ALTERNATING CURRENT
356165
A 100 \(W\)/200 \(V\) bulb and an inductor are connected in series to a \(220V/50Hz\) supply. Find the power consumed by the bulb. \((L = 1H)\)
356163
A choke coil has negligible resistance. The alternating potential drop across it is \(220\,volts\) and the current is \(5\,mA.\) The power consumed is
1 \(220 \times \frac{5}{{1000}}\;W\)
2 \(\frac{{220}}{5}\;W\)
3 Zero
4 \(2.20 \times 5\;W\)
Explanation:
Phase angle \(=\dfrac{\pi}{2}\) (between \(V\) and \(I\) ) \(\Rightarrow \cos \phi=0\) \(\Rightarrow \cos \phi=0\) \(\Rightarrow\langle P\rangle=0\) Since \(\langle P\rangle=V I \cos \phi\) Average power is zero. So, correct option is (3).
PHXII07:ALTERNATING CURRENT
356164
An electric heater rated \(225V\) and \(550W\) is connected to \(AC\) mains. The current drawn by it is:
1 \(0.8\,A\)
2 \(2.0\,A\)
3 \(0.4\,A\)
4 \(1.25\,A\)
Explanation:
\(\because P = VI \Rightarrow I = \frac{P}{V} = \frac{{550}}{{225}} = 2.0A\)
PHXII07:ALTERNATING CURRENT
356165
A 100 \(W\)/200 \(V\) bulb and an inductor are connected in series to a \(220V/50Hz\) supply. Find the power consumed by the bulb. \((L = 1H)\)
