The maximum power rating of a `20 Omega` resistor is 2.0 kW. [That is, this is the maximum power the resistor can dissipate (as heat) without melting or changing in some other undersirable way]. Would you connect this resistor directly across a 300 V d.c. source of negligible internal resistance ? Explain your answer.

The maximum power rating of a 20Omega resistor is 2.0kW. (that is this is the maximum power the resistor can dissipate (as heat) without melting or changing in some other undesirable way). Would you connect his resistor directly across a 300V d.c. source of negligible internal resistance?

The power of resistor is the maximum power the resistor can safely dissipate without too rise in temperature. The power rating of a 15 kOmega resistor is 5.0 W . What is the maximum allowable potential difference across the terminals of the resistor? (b) A 9.0 kOmega resistor is to be connected across a 120 V potential difference. What power rating is required?

Three 200 Omega resistors are connected as shown in figure. The maximum power that can be dissipated in any one of the resistor is 50 W. Find the total power in watts dissipated in the circuit for maximum voltage across the terminals A and B.

In the circuit shown in fig. 7.24 , all the resistors are rated at a maximum power of 1.00 W . What is the maximum emf epsilon that the battery can have without burning up any of the resistors?

A resistance of 25 Omega is connected to 100 V, 50 Hz a.c. source. What is the maximum instanteous current in the resistor?

Three 10 Omega , 2 W resistors are connected as in Fig. 7.34 . The maximum possible voltage between points A and B without exceeding the power dissipation limits of any of the resistors is

A current of 2 mA was passed through an unknown resistor which dissipated a power of 4.4 W. Dissipated power when an ideal power supply of 11 V is connected across it is

(a) Two heater coils made of the same material are connected in paralled across the mains. The length of diameter of one the coil is triple that of other. Which of these will produce more heat? (b) Three equal resistors connected in series across a source of emf together dissipated 10 Watt of power. What would be the power disspated if the same resistors are connected in parallel across the same source of emf? Two resistor R_(1) and R_(2) may be connect either in series or in parellel across a battery of zero internal resistance. it is required that joule heating for the parallel combination be four times than for series combination. if R_(1)= 100 Omega find R_(2) (d) The three resistance A, B and C have values 3R, 6R and R respectively. Now some potential difference is applied across the network . Find the ratio of thermal powers dissipated between X and Y . find ratio of power consumed by A,B, and C .

Three equal resistors connected in series across a source of emf together dissipate 10W of power. What would be the power dissipated if te same resistors are connected in parallel across the same source of emf?