0
Since we don't know any different, we must assume that the little lamps are all
electrically identical.
Then, as long as the string is lighted and nothing has burned out yet, the current
through it doesn't matter. The supply voltage divides equally across each unit in
the string.
240/40 = 6 volts across each little lamp.
Since we're also given the current in the string, we can also go on to calculate:
-- Resistance of each lamp = E/I = 6/0.25 = 24 ohms
-- Power dissipated by each lamp = E I = 6 x 0.250 = 1.5 watts
-- Total power supplied by the source = 1.5 watts x 40 lamps = 60 watts
or 240 volts x 0.250 amps = 60 watts.
What else can I help you with?
How to calculate the potential difference across a capacitor?
To calculate the potential difference across a capacitor, you can use the formula V Q/C, where V is the potential difference, Q is the charge stored on the capacitor, and C is the capacitance of the capacitor.
How is a voltmeter connected in the circuit to measure the potential difference between two points?
The voltmeter is connected in parallel between the two points whose potential difference is required.
When measuring the potential difference across a componet you need?
A voltmeter connected in parallel.
How is ohm's law written to calculate potential difference?
V=i.r
How can you calculate the potential difference between two points in a circuit?
To calculate the potential difference between two points in a circuit, you can use Ohm's Law, which states that voltage (V) equals current (I) multiplied by resistance (R). The formula is V I x R. By knowing the current flowing through the circuit and the resistance between the two points, you can calculate the potential difference.
Three cells have voltage of 15V 18V and 20 V What is the total voltage of the cells when they are connected in parallel?
Sources with different voltages should never be connected in parallel, you would have a difference of potential. Any time you have a difference of potential connected together you will have sparks, which could cause the batteries to explode.
Calculate the resistance when current 0.24 and potential difference 4.0 A?
I don't no
What happens when two or more capacitors are connected in parallel across a potential difference?
When two or more capacitors are connected in parallel across a potential difference, the total capacitance increases. This is because the equivalent capacitance of capacitors in parallel is the sum of their individual capacitances.
How do you calculate potential difference from a graph?
To calculate the potential difference from a graph, you need to determine the vertical distance between two points on the graph that correspond to different potential values. This vertical distance represents the potential difference between those two points. You can measure this distance using the scales on the axes of the graph.
How should voltmeter be connected to measure the potential difference across a resistor - in series or in parallel?
In parallel.
What happens when two or more capacitors are connected in series across a potential difference?
When two or more capacitors are connected in series across a potential difference, the total capacitance decreases and the total voltage across the capacitors is divided among them based on their individual capacitances.
How is a voltmeter connected in a circuit to measure electrical potential difference?
A voltmeter is connected in parallel to the component or circuit being measured to measure the electrical potential difference, also known as voltage. This allows the voltmeter to read the voltage across the component or circuit accurately.
