Th S.I. unit of energy is joul(J). Let the power (p) of an electrical appliance = P wattLet it is used for t seconds. Then Electrical energy consumed (W) = P x t watt-secondi.e. W = Pt Watt-secondor W = Pt Joul (Joul is Mechanical unit equivalent of Watt-second) In practice bigger unit like Watt-Hour … Read more
Electrical Power: Rate of electrical energy supplied by a source e.g. a power station or an alternator or a dc battery etc is called electrical power. ∴ Power = Electrical Energy supplied / Time if Power = PEnergy supplied = Wand Time = T Then P = W / Tif W is in JoulT in … Read more
Love Concern Humanity And Trust are the Eccentric Features of Mankind . Quoting examples from chapters : “The Last Leaf”, Journey by Night”, and “God Lives in Panch”, Justify the statement . The main element which makes us differ from the rest are the qualities we possess.” Human nature is something which cannot be taught … Read more
Ohm’s Law: It can be defined as “The potential difference (P.D.) across a conductor is proportional to the current flowing through it provided that physical conditions remain constant.” If V = Potential Difference (P.D.)I= current Then we can write V ∝ I Or V= I. R R= Constant and it is known as resistance of … Read more
By:R.K. Narayan 1. At nine-thirty, when he ought to have been shouting………… Q ( A): What would Swami usually do during prayer time at school? Q ( B ): What, According to father,is the cause of Swami’s headache? Q ( C ): Is Swami honest in his words? When he give the excuse. … Read more
ABCD is a rhombus. DPR and CBR are straight lines. Prove that: DP.CR=DC.PR Solution: DP.CR=DC.PR Given ABCD is rhombus . DPR and CBR are straight lines.∴ AD||CR we need to Prove : DP.CR=DC.PRIn ∆ ADP and ∆ PCRWe have : ∠ APD = ∠ CPR ∠ ADP = ∠ PRC ∠ DAP = ∠ PCR … Read more
Suppose a Current I flows through a circuit as shown in the figure. The voltage across the resistance is V . The P.D. is the work done to move a charge Q from one point to another point, between which the p.d. is applied. W = QVBut, Q= I.t ∴ W = VIt Another energy … Read more
– writer’s name The man who is the speaker in this poem is a retired professor. He is known as Professor Seth. He addresses his student by telling him “Remember me? I am Professor Seth”. The Professor has made a language error while talking to his student but he has used this awkward type of … Read more
By – Douglas Malloch The poem ” Be the best” teaches us a very important lesson of our life. The title is sufficient for anyone to understand the concept of the poem. The poet Douglas Malloch wants to tell us that whatever you want to be or whatever you can be ,just be the best … Read more
Emf: Emf is defined as work done per unit charge in taking a positive charge through the complete circuit ( the circuit outside the source (cell) and inside of the source. emf is represented by greek letter ε If W is the work done when a test charge of q0 is taken through the complete … Read more