To verify Ohm's law, a student connects the voltmeter across the battery as shown in the figure. The measure voltage is plotted as a function of the current, and the following graph is obtained if `V_(O)` is almost zero. identify the correct statement
A
the emf of the battery is 1.5 V and its internal resistance is `1.5Omega`
B
The value of the resistance R is `1.5Omega`
C
The potential difference across the battery is 1.5 V when it sends a current of 1000 mA.
D
The emf of the battery is 1.5 V and the value of R is `1.5Omega`
A students connects an ammeter A and a voltmeter V to measure a resistancer as shown in figure. If the voltmeter reads 20 V and the ammeter reads 4A , then R is
If graph of a function f(x) which is defined in [-1, 4] is shown in the following figure then identify the correct statement(s).
Different voltages are applied across a P-N junction and the currents are measured for each value. Which of the following graphs is obtained between voltage and current?
An ac source of voltage V=V_(m)sin omega t is connected across the resistance R as shown in figure. The phase relation between current and voltage for this circuit is
In the situation shown in figure , an ideal ammeter is connected across 7 Omega resistors. Select the correct statement from the following
Five capacitors are connected across a battery of 5V as shown in figure (o). Calculate the potential difference across the plates of the 5muF capacitor.
The variation of current (I) and voltage (V) is as shown in figure A . The variation of power P with current I is best shown by which of the following graph
The circuit of a carbon are lamp is shown in the figure (to ignite the lamp the carbon electrodes are touched together, then they are slowly drawn apart). The voltage across the gap between the carbon rods as a function of the current can be given by the following formula : V=A + B//I , where A and B are constants. If the voltage of the battery V_0 can be considered constant what is the maximum resistance of the rheostat R_max , that should be connected in series to ignite the lamp. Data: A=40V, B=20W, V_0 =100V
