If we connect the resistors in series, then the equivalent resistance will be the sum of the resistors, i.e., 6 Ω + 6 Ω + 6 Ω = 18 Ω, which is not desired. If we connect the resistors in parallel, then the equivalent resistance will be 6/2= 3ohm which is also not desired. Hence, we should eitRead more
If we connect the resistors in series, then the equivalent resistance will be the sum of the resistors, i.e., 6 Ω + 6 Ω + 6 Ω = 18 Ω, which is not desired. If we connect the resistors in parallel, then the equivalent resistance will be
6/2= 3ohm
which is also not desired. Hence, we should either connect the two resistors in series or parallel.
(i) Two resistors in parallel
Two 6 Ω resistors are connected in parallel. Their equivalent resistance will be
1/(1/6 + 1/6) = 3ohm
The third 6 Ω resistor is in series with 3 Ω. Hence, the equivalent resistance of the circuit is 6 Ω + 3 Ω = 9 Ω.
(ii) Two resistors in series
Two 6 Ω resistors are in series. Their equivalent resistance will be the sum 6 + 6 = 12 Ω
The third 6 Ω resistor is in parallel with 12 Ω. Hence, equivalent resistance will be
Supply voltage, V = 220 V Resistance of one coil, R = 24 Ω (i) Coils are used separately According to Ohm’s law, V = I1R1 Where, I1 is the current flowing through the coil 𝐼=𝑉𝑅=220/24=55/6=9.16 𝐴 Therefore, 9.16 A current will flow through the coil when used separately. (ii) Coils are connectRead more
Supply voltage, V = 220 V
Resistance of one coil, R = 24 Ω
(i) Coils are used separately
According to Ohm’s law,
V = I1R1
Where,
I1 is the current flowing through the coil
𝐼=𝑉𝑅=220/24=55/6=9.16 𝐴
Therefore, 9.16 A current will flow through the coil when used separately.
(ii) Coils are connected in series
Total resistance, R2 = 24 Ω + 24 Ω = 48 Ω
According to Ohm’s law,
V = I2R2
Where,
I2 is the current flowing through the series circuit
𝐼=𝑉𝑅=220/48=55/12=4.58 𝐴
Therefore, 4.58 A current will flow through the circuit when the coils are connected in series.
(iii) Coils are connected in parallel
Total resistance, R3 is given as
1/𝑅=1/24+1/24=2/24=1/12 ⟹𝑅=12 Ω
According to Ohm’s law,
V = I3R3
Where,
I3 is the current flowing through the circuit
𝐼=𝑉𝑅=22012=553=18.33 𝐴
Therefore, 18.33 A current will flow through the circuit when coils are connected in parallel.
Movement of leaves of the sensitive plant 1. It does not depend on the direction of stimulus applied. 2. Touch is the stimulus. 3. Caused by the sudden loss of water from the swellings at the base of leaves. 4. Occurs very fast Movement of a shoot towards light 1. Depends on the direction of stimulRead more
Movement of leaves of the sensitive plant
1. It does not depend on the direction of stimulus applied.
2. Touch is the stimulus.
3. Caused by the sudden loss of water from the
swellings at the base of leaves.
4. Occurs very fast
Movement of a shoot towards light
1. Depends on the direction of stimulus applied.
2. Light is the stimulus.
3. Caused by the unequal growth on the two sides of the shoot.
Reflex action are the involuntary actions that occur in response to stimuli. They occur without involvement of conscious areas of brain. All the reflex actions are unconscious actions. Reflex action occurs brain and spinal cord of central nervous systems. On the other hand voluntary actions are thosRead more
Reflex action are the involuntary actions that occur in response to stimuli. They occur
without involvement of conscious areas of brain. All the reflex actions are unconscious
actions. Reflex action occurs brain and spinal cord of central nervous systems.
On the other hand voluntary actions are those which occur under the control of cerebellum of the brain Walking is learnt as we grow. Walking is controlled by brain as is used when
required.
Show how you would connect three resistors, each of resistance 6 W, so that the combination has a resistance of (i) 9 ohm, (ii) 4 ohm.
If we connect the resistors in series, then the equivalent resistance will be the sum of the resistors, i.e., 6 Ω + 6 Ω + 6 Ω = 18 Ω, which is not desired. If we connect the resistors in parallel, then the equivalent resistance will be 6/2= 3ohm which is also not desired. Hence, we should eitRead more
If we connect the resistors in series, then the equivalent resistance will be the sum of the resistors, i.e., 6 Ω + 6 Ω + 6 Ω = 18 Ω, which is not desired. If we connect the resistors in parallel, then the equivalent resistance will be
6/2= 3ohm
which is also not desired. Hence, we should either connect the two resistors in series or parallel.
(i) Two resistors in parallel
Two 6 Ω resistors are connected in parallel. Their equivalent resistance will be
1/(1/6 + 1/6) = 3ohm
The third 6 Ω resistor is in series with 3 Ω. Hence, the equivalent resistance of the circuit is 6 Ω + 3 Ω = 9 Ω.
(ii) Two resistors in series
Two 6 Ω resistors are in series. Their equivalent resistance will be the sum 6 + 6 = 12 Ω
The third 6 Ω resistor is in parallel with 12 Ω. Hence, equivalent resistance will be
1/(1/12 + 1/6) = 4ohm
Therefore, the total resistance is 4 Ω.
See lessA hot plate of an electric oven connected to a 220 V line has two resistance coils A and B, each of 24 ohm resistance, which may be used separately, in series, or in parallel. What are the currents in the three cases?
Supply voltage, V = 220 V Resistance of one coil, R = 24 Ω (i) Coils are used separately According to Ohm’s law, V = I1R1 Where, I1 is the current flowing through the coil 𝐼=𝑉𝑅=220/24=55/6=9.16 𝐴 Therefore, 9.16 A current will flow through the coil when used separately. (ii) Coils are connectRead more
Supply voltage, V = 220 V
Resistance of one coil, R = 24 Ω
(i) Coils are used separately
According to Ohm’s law,
V = I1R1
Where,
I1 is the current flowing through the coil
𝐼=𝑉𝑅=220/24=55/6=9.16 𝐴
Therefore, 9.16 A current will flow through the coil when used separately.
(ii) Coils are connected in series
Total resistance, R2 = 24 Ω + 24 Ω = 48 Ω
According to Ohm’s law,
V = I2R2
Where,
I2 is the current flowing through the series circuit
𝐼=𝑉𝑅=220/48=55/12=4.58 𝐴
Therefore, 4.58 A current will flow through the circuit when the coils are connected in series.
(iii) Coils are connected in parallel
Total resistance, R3 is given as
1/𝑅=1/24+1/24=2/24=1/12 ⟹𝑅=12 Ω
According to Ohm’s law,
V = I3R3
Where,
I3 is the current flowing through the circuit
𝐼=𝑉𝑅=22012=553=18.33 𝐴
Therefore, 18.33 A current will flow through the circuit when coils are connected in parallel.
See lessHow is the movement of leaves of the sensitive plant different from the movement of a shoot towards light?
Movement of leaves of the sensitive plant 1. It does not depend on the direction of stimulus applied. 2. Touch is the stimulus. 3. Caused by the sudden loss of water from the swellings at the base of leaves. 4. Occurs very fast Movement of a shoot towards light 1. Depends on the direction of stimulRead more
Movement of leaves of the sensitive plant
1. It does not depend on the direction of stimulus applied.
2. Touch is the stimulus.
3. Caused by the sudden loss of water from the
swellings at the base of leaves.
4. Occurs very fast
Movement of a shoot towards light
1. Depends on the direction of stimulus applied.
2. Light is the stimulus.
3. Caused by the unequal growth on the two sides of the shoot.
4. Occurs slowly.
See lessWhat is the difference between a reflex action and walking?
Reflex action are the involuntary actions that occur in response to stimuli. They occur without involvement of conscious areas of brain. All the reflex actions are unconscious actions. Reflex action occurs brain and spinal cord of central nervous systems. On the other hand voluntary actions are thosRead more
Reflex action are the involuntary actions that occur in response to stimuli. They occur
See lesswithout involvement of conscious areas of brain. All the reflex actions are unconscious
actions. Reflex action occurs brain and spinal cord of central nervous systems.
On the other hand voluntary actions are those which occur under the control of cerebellum of the brain Walking is learnt as we grow. Walking is controlled by brain as is used when
required.