an iron has a power of 1,000w. how much energy will it electrically transfer each second?

The iron transfers 1,000 joules of energy every second.

Key idea

• Power is the rate of energy transfer, given by P=EtP=\frac{E}{t}P=tE​, where:
  • PPP is power in watts (W),
  • EEE is energy in joules (J),
  • ttt is time in seconds (s).

• One watt is defined as one joule per second, so 1,000 W means 1,000 J of energy transferred each second.

Quick calculation

• Given: P=1,000textW=1,000textJ/sP=1{,}000\\text{W}=1{,}000\\text{J/s}P=1,000textW=1,000textJ/s.

• Time: t=1textst=1\\text{s}t=1texts.
• Energy per second: E=P×t=1,000×1=1,000textJE=P\times t=1{,}000\times 1=1{,}000\\text{J}E=P×t=1,000×1=1,000textJ.

So the iron electrically transfers 1,000 joules of energy each second.

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